A woman fell asleep on a train and awoke to find a man sexually assaulting her.

British Transport Police believe the attacker preyed on the 26-year-old as she dozed on a train from Victoria to East Croydon The serious sex attack happened at Victoria station on Saturday, March 1 between 12.15am and 12:35am.

The man was white, slightly overweight, aged 35 to 45 years with light brown cropped receding hair. He had glasses and wore a dark blue Adidas jogging top.

Police believe the man lives in the Battersea area and appeal to anyone who may be able to identify him to contact officers.

Anyone with information should contact the BTP on 0800 40 50 40 or the Witness Appeal Line on 0207 391 5275, quoting background log B4 of 11/3/08.