The assailant, 29, was subdued with a stun gun and arrested on suspicion of attempted murder at 7:14 p.m. Saturday in the suburb of Leytonstone, London’s Metropolitan Police said

Police had been dispatched to the station after receiving emergency calls reporting that a man had stabbed people and was threatening others, police said. The man threatened officers as they tried to reason with him, a statement said.

Police are looking into reports that the suspect yelled, “This is for Syria,” during the attack, said Chioma Dijeh, a spokeswoman for the Metropolitan Police.

One man, 56, suffered serious knife injuries in the attack and was taken to an east London hospital, where he remains in a stable condition. His injuries are not considered life-threatening, police said.

A second man received a minor injury that did not require medical treatment, while a woman was also threatened by the suspect, police said.

Authorities initially said one person was seriously injured and two others lightly injured.