Eight days have passed since Hull student Libby Squires went missing.
Despite it being treated as a missing person case, Humberside Police have sent more than 70 officers out onto the streets of the East Yorkshire city to search for the 21-year-old.
As the days have passed, the concern for the philosophy student has increased.
Officers started smashing their way through frozen ponds and combing rivers and streams as the search widened, but there was still no trace.
Ms Squire's desperate parents travelled from High Wycombe in Buckinghamshire to Hull to make an emotional plea in an attempt to bring their daughter home.
On the eve of the seventh day of the investigation, an arrest was made. Detectives took Paweł Rełowicz, a 24-year-old Polish father-of-two, into custody on suspicion of abduction and towed a silver Vauxhall Astra from the scene.
Here, we take a look at the key events.
Jan 31, 11pm: Refused entry from club for being 'too drunk'
Thursday nights at The Welly in Hull is a popular student haunt.
The night is advertised as Jelly Thursdays by the owners, which celebrates indie rock and punk rock anthems in two rooms, named the Main Room and The Cell.
Doors to the club do not open until 10.30pm, and it was around half an hour later when Libby Squire was reportedly turned away by security staff for being too drunk.
Instead of leaving her stranded on Beverley Road, one of the city's main streets, the 21-year-old's friends put her in a taxi.
Jan 31, 11.29pm: Arrives home, but does not go into house
Less than half an hour after being turned away from The Welly, Libby Squires' taxi pulled up outside her house in Wellesley Avenue.
The driver will have driven north on Beverley Road for just over a mile, passing kebab shops and a Humberside Police station, before turning right onto the leafy avenue on which the student lived.
It's understood that having left the taxi at 11.29pm, Ms Squire did not enter the property.
Police later searched the house and found her mobile phone inside, but it did not offer up any clues as to where she might be.
Jan 31, 11.40pm: CCTV spots Libby Squire on bench
Ten minutes pass before the philosophy student is picked up on CCTV.
She is back on Beverley Road, on a bench near a bus stop on the junction with Haworth Street.
The bench is around 350 yards from Wellesley Avenue, roughly a four-minute walk.
Security footage seen by police places her near the bench at 11.40pm.
Jan 31, 11.45pm: Motorist stops to help missing student
A driver in a silver Citreon car - thought to be a Xsara or a Picasso model - reportedly stops to help Libby Squire.
He is described as having long grey hair and a grey beard, according to local news website Hull Live, and could also have been travelling with a passenger in the car.
Police understand this was at 11.45pm and was near the junction of Beverley Road and Beresford Avenue - a road which is just yards away from the bench and that links to Wellesley Avenue.
The driver leaves, and the student remains near the bench until around 12.09am, Police believe. Forty minutes have now elapsed since she was dropped off outside her home.
These are Libby Squire's last known whereabouts.
Feb 1/2: Search begins as Libby is reported missing
After officers failed to locate Libby in the hours after her disappearance, the search is bolstered on Saturday, with more than 70 officers out on the streets.
They are joined by 200 students and staff from the University of Hull.
Superintendent Simon Gawthorpe said on Saturday: "Over 70 officers have been out searching speaking to her friends, visiting the pubs and clubs in the area and making inquiries with those who saw her during the evening.
"Despite these efforts, we still have not located Libby and as you can understand we are extremely concerned for her welfare."
He added: "We continue to ask those living in that area to check their gardens and out buildings in case Libby has taken shelter and if anyone was driving around the area between 11pm Thursday night and 3am Friday morning and has dash cam footage, please come forward by contacting 101.
"We are supporting Libby's family who have described her as a very thoughtful and caring young woman who puts others before herself.
"They say that this is very out of character."
On Saturday, officers could be seen scattered around the area where Miss Squire was last seen, and a group of students searched sports fields by the university in a bid to find their friend.
Feb 3: Coastguard called in as search enters third day
The Coastguard is drafted in to help with the search for missing student Libby Squire as it enters its third day.
Humberside Police say the motorist who helped Ms Squire had contacted them and "really helped" with the search.
Detective Superintendent Simon Gawthorpe says: "We have specialist teams again out today carrying out searches and we are working with Humberside Fire and Rescue and the Coastguard, who will be around the River Hull."
The student's mother, Lisa Squire, speaks for the first time as she takes to Facebook to urge her daughter to come home, saying that she is "broken" without her.
Thanking the students who searched the university campus on Saturday, she says in the post: "She is obviously loved by so many."
The family had previously said that the student's disappearance is "very out of character", and that she is a "very thoughtful and caring young woman who puts others before herself".
Police urge anyone living around the area that Miss Squire was last spotted in to check their gardens and outbuildings in case she has taken shelter from the cold weather.
Feb 4: Mother's emotional appeal for missing daughter
Lisa Squire makes an emotional appeal to her daughter Libby to get in touch as the search for her entered its fourth day.
Having travelled to Hull from High Wycombe in Buckinghamshire, she tells the 21-year-old University of Hull student in a video appeal: "It is breaking my heart not knowing where you are."
Her parents issued the statement through Humberside Police as police scoured a waterway and searched bins and drains near the student's home on Wellesley Avenue in Hull.
Mrs Squire, calling her daughter "darling pie", says: "We just want to know that you are safe. Please get in touch with us any way you can."
Russell Squire, Ms Squire's father, describes his daughter as "our kind, thoughtful, beautiful girl" who is "loved by so many people".
Speaking directly to Ms Squire, he says: "We just want you home."
Mr Squire appeals for people to come forward with information "no matter how small or irrelevant it may be" and thanks everyone for their support during what he describes as a "very difficult time".
He says: "Your messages and kind words are a great source of strength to us both."
Nearby, officers from the police marine unit travel along a length of the frozen Beverley and Barmston Drain in inflatable rafts, breaking the ice and searching the water.
Feb 5: Police investigate 'blood-curdling' screams
Police confirm they are following up a number of lines of inquiry, including reports that a neighbour heard a "blood-curdling" scream on the night she disappeared.
A woman living in a street close to Miss Squire's home says she heard a scream which she said "sounded like someone being attacked".
A police spokeswoman says: "We have received hundreds of calls from members of the public offering information and their assistance, and we are extremely grateful for everyone's help.
"Our house-to-house inquiries are continuing and we are visiting residents to speak to people and take statements as part of the ongoing investigation."
The neighbour, who lives in nearby Heathcote Street some 100 yards from Miss Squire's Wellesley Avenue Hull home, told The Mail: "It sounded like it was from someone walking past outside our house. At the time, I thought a woman was being attacked. It sounded like it was coming from someone who was scared."
She later recalls hearing "muttering voices" and the sound of a wooden door slamming as well as another scream.
As the search enters its fifth day, officers from the police regional marine unit search a pond at Oak Road Playing Fields, near to Miss Squire's home.
Four officers wade through the waist-deep water, using sticks to break the ice and search beneath the surface.
Feb 6 (am): Six days later, and still no sign
The parents of missing student Libby Squire thank everyone who has helped in the search for their daughter, saying they have been "overwhelmed with people's kindness and support".
Lisa and Russ Squire issue a statement which says: "We'd like to thank everyone who has helped this week in trying to find Libby.
"We have been overwhelmed with people's kindness and support and it's been incredible how all her friends, students at the university, and members of the public have joined together to help us look for her."
Humberside Police say Mr and Mrs Squire have met with their daughter's friends and university staff as the search enters its sixth day without a trace of the missing student.
In their statement, the couple say Ms Squire - whose full name is Liberty Anna - has two younger sisters and a younger brother, who all live in High Wycombe.
They say: "Growing up, Libby was a really happy child, and she is extremely close to her family and her siblings."
Mr and Mrs Squire explain how Libby enjoyed English Language, English Literature and Latin at school and has a close group of friends stretching back to primary school.
They say she moved to Hull in September 2017 to study philosophy and was "really happy" at the university with a "lovely group of friends".
The couple say: "Libby decided to come to Hull University when she fell in love with the city.
"She accepted an offer at the university before even visiting as she was so sure she would be happy here."
They say their daughter enjoys reading and going to the gym as well as loving travelling, music and going out to concerts.
Feb 7 (pm): Arrest made on suspicion of abduction
Humberside Police raid a house half a mile away from where Libby Squire was last seen.
He is arrested on Wednesday night and as well as taking him into custody, a silver Vauxhall Astra is towed from Raglan Street in Hull.
Details of the arrest emerge the following morning and a force spokesman says: " A 24-year-old man has been arrested in connection with the disappearance of Hull student Libby Squire.
"Officers made the arrest at an address in Raglan Street, Hull, last night.
"The man remains in our custody, assisting us with our enquires. We have not yet found Libby and doing so remains our top priority.
"Libby's parents have been informed of the man's arrest and we're continuing to support them at this difficult time."
Humberside Police issue an update at lunchtime, reinforcing the fact they are still treating the disappearance as a missing person case.
Detective Superintendent Matt Hutchinson said: "I have said previously that we are keeping an open mind as to her whereabouts and that is still very much the case.
"During the course of our investigations we have spoken to a taxi driver and another motorist who stopped to help Libby on the night. I want to make it clear that these two individuals are not suspects in this enquiry."
Feb 7 (am): Held man named as Polish butcher
It emerges the 24-year-old arrested on suspicion of abduction is a Polish father-of-two.
Paweł Rełowicz, who works as a butcher in Malton, North Yorkshire, was detained at his rented home in Raglan Street, Hull late on Wednesday night.
Mr Relowicz, who has been in the UK since 2014, lives with his wife their two-year-old son and three month old baby.
The family live in a smart terraced house just a few minutes away from where Miss Squire, 21, was last seen sitting on a bench.
It also emerges that the silver Vauxhall Astra taken away by for forensic examination is Mr Relowicz's.
Mr Relowicz is from western Poland and moved to Hull in 2014.
He works at a food company in Malton, North Yorkshire where he is employed as a butcher.
Mr Relowicz's landlord, who asked not be named, describes him as a pleasant, polite family man, who had never caused any problems during his tenancy.
He said: "He is very much a family man from what I know. The house is always clean and tidy and the rent is always paid on time."
A former tenant at the property reveals Mr Relowicz had moved in with his young family in 2017.
He says: "Their English wasn't that good so they weren't that talkative."
A police car is parked outside the property and a child's bike can be seen in the living room.
Forensics teams come in and out of the property as the day progressed.
Feb 7 (pm): Arrested man 'offered to give missing student lift home'
Paulina Szymanska, sister of Mr Relowicz, tells The Telegraph he stopped to help Miss Squire when he spotted her crying at the side of the road.
Insisting he had nothing to do with her disappearance, she said: "I don't believe my brother could do it. We were raised to be good people. He was driving and he stopped because he noticed a girl crying.
"She asked him to take her home, so he put her address into his sat nav and wanted to do just that. Apparently she threw herself at him, but he pushed her away because he is a married man."
Police examining CCTV footage
Police investigating the disappearance of student Libby Squire are examining CCTV footage which may show her getting into a car close to where she was last seen.
The film, which was captured on the night of Thursday January 31, around the time Miss Squire went missing, shows a motorist parked up at the side of the road, just yards from where she was sitting on a bench.
After several minutes the driver, who appears to be sat rolling a cigarette, moves away from the car, before returning when another person is seen getting into the passenger side.
It is hoped the footage can help unlock the mystery of what happened to the 21-year-old Hull University student.
Detective Superintendent Matt Hutchinson said: “There have been hundreds of hours of CCTV footage viewed as part of our investigation into the disappearance of Libby Squire.
“There are various lines of enquiry we have investigated and are following up in connection to CCTV footage.
“Our priority remains to find Libby and support her family during this incredibly distressing time. We continue to keep an open mind and would ask anyone who believes they have information that could assist with the investigation to please make contact with police.”
On Friday police were given more time to continue questioning Mr Relowicz.
Police given another 24 hours
Police investigating the disappearance of Miss Squire are given another 24 hours to question Mr Relowicz.
Humberside Police said: "A further extension has been granted by the courts for officers to question a man arrested in connection with the disappearance of Hull student Libby Squire.
"The extension allows officer to continue to question the 24-year-old until 9pm tomorrow, Sunday February 10."
Police continued to search for the University of Hull student on Saturday, with officers using sticks and cameras to scour gardens and alleyways in the area around her home on Wellesley Avenue.
The force also unveiled digital missing posters, featuring pictures of Miss Squire and an appeal for information, in the city centre.
Suspect charged with unrelated offences
Mr Relowicz remains under investigation over Miss Squire disappearance and is charged with five unrelated offences, which are alleged to have taken place between December 2017 and January 2019.
Detective Superintendent Matt Hutchinson said: "24-year-old Pawel Relowicz of Raglan Street, Hull has today been charged with voyeurism, outraging public decency and three counts of burglary.
"An offence of outraging public decency was reported to have taken place on 19 January 2019 in Hull and an offence of voyeurism was reported on the 26 December 2018 in Hull.
"The three burglaries were reported between December 2017 and January 2019.”
He remains in custody and is will appear at Hull Magistrates Court on Monday morning.