Woman sexually assaulted on London Underground in daytime attack

Officers want to speak to this man, who they believe could help with the sexual assault investigation (Picture: British Transport Police)

A woman was sexually assaulted on the London Underground by a man standing behind her.

Detectives are investigating the attack, which happened during the day on board a southbound Victoria line Tube train.

The woman was travelling on the train at about 10.30am on Wednesday, February 21, when she was targeted.

The train was near...