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One person said on Twitter: "Man with a massive machete wandering back and forth at Tulse Hill station ranting.

"Police have arrived, but may be worth avoiding the area."

In one image on social media, a number of officers are seen pinning the suspect to the ground.

Police later confirmed the suspect had been tasered, and arrested on suspicion of murder.

A witness wrote: "Man at Tulse Hill Station with a massive machete just been tasered by the police."

(Image: TWITTER/@LITTLEMANALEX1)

Another added: "Just at Tulse Hill Station where the guy was wielding a machete – he's been subdued by the police, I don't believe anyone was hurt.

"Massive thank you and well done to the Police."

In a statement, British Transport Police said: "Shortly after 6.30pm today officers from British Transport Police and the Metropolitan Police were called to Tulse Hill station after reports of a man in possession of a knife.

"Police officers were quickly on scene and detained a man on the platforms at the station. During the detainment a Taser device was discharged.

(Image: PA)

"The man was arrested on suspicion of attempted murder and possession of an offensive weapon, he is being taken to custody.

"There are no reported injuries."Anyone who witnessed what happened is asked to contact BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 478 of 14/01/2019."This incident is not currently believed to be terror related."