An eyewitness of the stabbing attack in east London has told ITV News that he shouted "this is for Syria" after the attack.
The incident just after 7pm on Saturday is being treated as a terrorist incident by police.
One man was seriously injured and two sustained minor injuries, police said.
Counter terrorism police have searched an east London property whilst investigating stabbings at a London tube station.
A man shouted "you ain't no Muslim, bruv!" in defiance of the Leytonstone knife attacker who claimed the attacks "for Syria".