A man with a knife has been arrested on suspicion of attempted murder by police who used a stun gun at a south London train station.

Officers from British Transport Police (BTP) and the Metropolitan police were called to Tulse Hill station just after 6.30pm on Monday after reports of a man with a knife.

Officers discharged a Taser electronic weapon as they detained a man on the platform at the station, BTP said.

Photos posted on social media show several police officers surrounding a man who appears to be lying on the floor.

The man, 59, was arrested on suspicion of attempted murder and possession of an offensive weapon, the force added.

Police said there were no reported injuries and the incident was not believed to be terror-related.

Conor Fortune said he was on a Thameslink train travelling away from central London at Tulse Hill station when he heard a male voice “shouting quite loudly”.

The train conductor then told passengers not to get off because there was “a dangerous man on the platform”, he said.

The 39-year-old, from south-west London, said: “After several minutes of being sat on the platform, the driver announced that we were being held and she shut the doors as a precaution, and advised nobody to get off.

“She informed us the police had been alerted and were responding.”

He added that he had been impressed by the train driver’s professionalism and at the rapid police response.