Three people were stabbed in a London Tube station Saturday evening in what police described as a possible "terrorist incident".
The suspect reportedly yelled "this is for Syria" several times after he was handcuffed. One person was seriously injured, the other two suffered minor injuries.
"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," Metropolitan Police said.