This is the dramatic moment police aimed Tasers at a man after he was spotted allegedly brandishing a samurai sword on a packed Tube train.

District line services were held underground for up to 20 minutes as armed police searched carriages in response to a 999 call from a worried commuter.

Officers traced the suspect to Court Street, Whitechapel, at around 5.40pm last night and arrested him in front of shoppers.

Dramatic footage posted on Twitter showed police aiming Tasers at the 39-year-old man before placing him handcuffs.

A British Transport Police spokesman said he had been arrested on suspicion of possession of two offensive weapons.

There were no reported injuries and police said the incident was not believed to be terror related.