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A stabbing at a Tube station in east London is being treated as a "terrorist incident", the Met Police has said, according to the BBC.

Police were called to reports of people being attacked at Leytonstone around 19:00 GMT on Saturday. The knifeman reportedly shouted "this is for Syria".

A man was arrested after being Tasered by police. One man suffered serious knife injuries while two others received minor injuries.

Metropolitan Police counter-terrorism detectives are investigating the case.

Downing Street said it was monitoring the situation closely.

The Met said the suspect was reportedly threatening other people with a knife.

A witness told the BBC he saw a man holding a knife, about 3ins (7.5cm) long, standing over another man who was lying on the ground, and people running out of the Central Line station.

Police said they received a call at 19:06 GMT and the man was arrested at 19:14.

They said the most seriously-hurt victim's injuries were not believed to be life-threatening.

Commander Richard Walton, who leads the Met's Counter-Terrorism Command, said: "We are treating this as a terrorist incident. I would urge the public to remain calm, but alert and vigilant.

"The threat from terrorism remains at severe, which means that a terrorist attack is highly likely”.