Days after British war planes began an expanded airstrike campaign against the Islamic State, a man on Saturday reportedly yelled “this is for Syria” before slashing at least one person with a knife in a London subway station.
A 56-year-old man sustained serious injuries in the attack but is now in stable condition, while another person sustained minor injuries, police said.
The assailant was arrested after police used a Taser to subdue him.
“I am treating this as a terrorist incident,” Richard Walton, who heads the Counter Terrorism Command at London’s Metropolitan Police, said in a statement.
“I would continue to urge the public to remain calm, but alert and vigilant,” he said.
The authorities have yet to identify the suspect, believed to be 29.
The stabbing incident took place just after 7 p.m. local time in London’s Leytonstone Underground station.
A video posted on Twitter after the incident showed a pool of blood on the floor of a subway station.
The Guardian reported the suspect told police he launched the attack because of Britain’s recent airstrikes, which began this week.
Police said they believe the assailant acted alone; detectives from the Metropolitan Police Service’s Counter Terrorism Command later searched an east London address.
Another video posted on The Guardian’s website shows the accused attacker, wearing a gray shirt, tan pants and hat, lunging toward people, including police officers, in a subway station. (A note, the footage in the video may be distressing to some viewers.)
Authorities then Tasered the suspect, who dropped to the ground and was handcuffed.