British Transport Police (BTP) are appealing for information after a man reportedly touched himself while whispering to a woman on the Central Line.

The next day he was seen doing the same thing on a London Overground service.

The first incident took place on a Central Line train, between Leyton and Newbury Park, just after 7pm on August 9.

The man, believed to be in his late 20s to early 30s, was seen inappropriately touching himself while whispering to a woman.

A male passenger intervened and photographed the offender to help police.

The next day, at 6.30pm, the man was spotted on a London Overground train, near Dalston Junction, touching himself sexually.

He was again photographed by a passenger.

Investigating officer Pc George James, said: “We simply will not tolerate behaviour such as this and we are working hard to find the person responsible.

“I am confident members of the public will recognise this man, and I would urge you to contact us as I believe he has essential information that will help us.

“We take all reports of this nature very seriously and our recent Report It to Stop It campaign, which aims to combat unwanted sexual behaviour on the railway by encouraging members of the public to report it, is proving very successful in supporting victims and bringing perpetrators of these crimes to justice.”

Anyone with any information is asked to contact BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 301 of 07/09/2016. Alternatively, information can be passed anonymously to independent charity Crimestoppers on 0800 555 111.