British Transport Police (BTP) believe the naked man, who has since been detained under the mental health act, was assaulted on the District line in east London .

Police are investigating the incident on the Hammersmith and City line in east London yesterday at 3.30pm.

Group of men remove suspect from train after he shouted at people and waved his belt around

British Transport Police (BTP) believe the naked man, who has since been detained under the mental health act, was assaulted on the District line in east London .

Passengers tackled man who exposed himself in front of children on busy underground train

Officers say man, who was later detained under the Mental Health Act, was assaulted during incident

The vigilante, who has been praised by some and criticised by others, has been questioned by detectives from British Transport Police (BTP) after coming forward to give his side…