Police are believed to be examining CCTV footage which shows a man getting in and out of a car minutes after the last sighting of missing student Libby Squire.
The footage, obtained by ITV news, appears to show a man sitting with his legs out the driver’s side door of a parked vehicle in Hull, said by the broadcaster to be close to where the Hull University student is thought to have disappeared.
He leaves the car, and a minute and a half later a man is then seen opening the front passenger side door and moving around before getting behind the wheel and driving away.
The clip is said by ITV news to be ‘a central part’ of the investigation into the philosophy student’s disappearance.
During the footage, thought to run from around a minute past midnight to a few seconds before 12.09am on February 1, a cyclist and car pass the parked vehicle.
It comes as Humberside Police were granted an extra 36 hours to question 24-year-old Paweł Rełowicz who was arrested on Wednesday on suspicion of abducting Libby.
The 21-year-old was reported missing from the city in the early hours and an intensive search has been mounted by police and volunteers over the last week.
The address where Rełowicz was arrested is about half a mile from Libby’s home.
Officers have said Libby was dropped off in a taxi near her home on Wellesley Avenue at 11.29pm on Thursday January 31 and was seen 10 minutes later on CCTV near a bench on Beverley Road, where a motorist stopped to offer help.
She is believed to have been in this area until about 12.09am on Friday.
Police said the taxi driver and motorist have been spoken to and are not suspects.
Supt Matt Hutchinson said hundreds of hours of CCTV footage had been trawled through by police investigators.
He added: ‘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.’