Avon and Somerset Police are tracing witnesses of a black Vauxhall Zafira in the search for missing Bristol teenager Becky Watts.
The 16-year-old was last seen at her home in Crown Hill on 19 February and the police hunt for her has since intensified.
Two people were arrested on Saturday (29 February) in connection with her disappearance and on 2 March police were given an extra 36 hours to question the pair.
Detectives now want to speak to former owners of a black Vauxhall Zafira - registration HY06 HYA - and are appealing to members of the public who saw the car between 19 and 23 February.
The search for the schoolgirl has been widened to include three homes in Wilton Close, Southmead, the Barton Hill district and the family home in St George.
Becky left her home with her phone, laptop and tablet device but did not tell her friends or family where she was going.
A laptop that was discovered in woodland near her home has since been ruled out as belonging to the missing girl.
Becky's parents, Darren and Angie-Mae Galsworthy, said they "continue to hope" she will be found safe but that they were "preparing themselves for the worst".