A reward of £5,000 is being offered for information about a man wanted for allegedly murdering his ex-partner and her mother.
Janbaz Tarin remains at large after Raneem Oudeh, 22, and her mother Khaola Saleem, 49, were stabbed to death in Northdown Road, Solihull, in the early hours of bank holiday Monday.
West Midlands Police has been searching for the 21-year-old since then, with several addresses linked to him being searched.
Officers have seized computer equipment and mobile phones for analysis.
The suspected murder weapon has also been recovered and a van seized for forensic examination.
But as Tarin has not yet been found, the independent charity Crimestoppers has put up a £5,000 reward for information from the public which leads to his arrest.
Detective Inspector Caroline Corfield, who is leading the investigation, said: "Someone out there knows where he is.
"I'm hoping this significant cash reward will persuade them to pick up the phone to Crimestoppers and provide the information.
"This is a shocking, tragic case in which a young mum - who has a two-year-old son - and her mother have both been murdered in cold blood.
"We need to trace the man responsible. Janbaz Tarin deserves no protection and I'd urge anyone who believes they know his whereabouts to call Crimestoppers on 0800 555111."
A post-mortem of the two women yesterday found they had died of multiple stab wounds.
Detectives also revealed the mother and daughter were on the phone to police as they were attacked.
Ms Oudeh had made multiple calls to emergency services that night but police struggled to locate the pair until a later call where the "situation escalated" and officers were dispatched, arriving "within minutes".
They were found with fatal stab wounds on Northdown Road and treated by paramedics, but were pronounced dead at the scene.
Police said Tarin is an Afghan national who arrived in the UK on Christmas Day 2012.
:: Anybody who sees Tarin should not approach him but ring 999 immediately.
:: A reward will only be provided if information leading to his address is given to the charity where callers remain anonymous.