An 18-year-old woman was grabbed in Reading but managed to break free and run home.
The woman was walking home along Liebenrood Road on Wednesday June, 19 when a car pulled alongside her and the driver asked if she wanted a lift.
She declined, but the man grabbed the woman's arm and tried to pull her into the car.
The victim managed to push away and call police.
The man's car was described as small, dark blue and similar to a Citroen X1.
Anyone with information should contact PC Sarah Holloway via the 24-hour Police Enquiry Centre on 101.
More top news
A mobile DNA screening unit has been set up in a village where detectives are working to find a grandmother's killer.
Tuesday night's weather for the east of the region
Tuesday night's weather for the west of the region