A teenage girl was sexually assaulted by a van driver who may have passed and noticed her before he struck.

The attack happened in Thame on April 26 as the 16-year-old was at the corner of Southern Road and Mitchell Close. Her attacker was a white man, who grabbed her before she managed to run away when a woman walked by.

Pc Rachel Carter of Thame police, said: "The girl noticed the man moments earlier as he drove past her in a white Transit van."

Anyone with information is asked to call Pc Carter on 08458 505505.