LONDON -- A stabbing at a Tube station in east London is being treated as a "terrorist incident," the Metropolitan Police said.

Police were called at 19:06 to reports of several people being stabbed at Leytonstone Underground station. The male suspect was reportedly threatening other people with a knife.

A man was arrested at 19:14 and taken to an east London police station where he remains in custody.

According to report, the man who apparently shouted "this is for Syria" has been arrested after stabbing a commuter.

One man suffered serious knife injuries while two other people have sustained minor injuries.

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," he said.