Detectives investigating the murder of Olivia Pratt-Korbel have released an image of an Audi Q3 as they continue to question a man on suspicion of her murder.
The car is believed to have taken Joseph Nee, the 35-year-old man who was injured in the shooting, to hospital.
Merseyside Police has appealed to anyone who saw the black Audi Q3 in the days leading up to the shooting to get in touch.
The vehicle has been seized and it is in the process of being forensically examined.
Detective Superintendent Mark Baker said: "Although we have made an arrest in connection with the horrific murder of Olivia, I want to make it completely clear that we need any information about this vehicle or the wider investigation as much as ever.
"Whatever information you have, and whether you are sure that it is the same vehicle or not, pass it on and we will assess its importance."
Aerial footage showing the arrest of a 36-year-old man on suspicion of Olivia's murder has also been released.
The suspect was arrested on two counts of attempted murder during an armed police operation on Thursday night.
One local described the raid on the block of flats in Huyton saying: "We saw armed police, all in black with balaclavas on and machine guns.
"They closed the road off.
"They were here at about 10.30pm for about an hour and anyone who came out of their house they would shout at to go in.
"I think it was coming to an end when I saw them because I saw them putting the battering ram back in the car."
Olivia's family has paid tribute to her, describing her as a "unique, chatty, nosey little girl who broke the mould when she was born".
They added: "Although her life was short, her personality certainly wasn't and she lived it to the most she could, and would blow people away with her wit and kindness."
The family has urged people to "do the right thing", and said: "If anyone knows anything, now is the time to speak up. It is not about being a 'snitch' or a 'grass', it is about finding out who took our baby away from us."
Convicted burglar Nee, 35, from the Dovecot area of Liverpool, has been named as the intended target of the shooting.
As Olivia lay dying, he was picked up by friends in a black Audi Q3 and taken to hospital.