A man stabbed three people at an east London Tube station Saturday before police subdued him with a stun gun and made an arrest, London's Metropolitan Police said.

Police said they were treating the stabbing at Leytonstone station as a terrorist incident.

One man sustained serious injuries not considered to be life-threatening, police said. Two others suffered minor injuries.

The suspect was taken to a London police station.

Police said they were called just after 7 p.m. to reports of a number of people stabbed at the station and a man threatening others with a knife.

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."
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