++PLEASE NOTE: SOME VIEWERS MAY FIND THIS VIDEO DISTRESSING++<br /><br />Footage of the arrest of a suspect in a knife attack at Leytonstone Underground Station on Saturday.<br /><br />A bystander can be heard shouting "You ain't no Muslim, Bruv!" as the suspect is being pinned to the ground by police.<br /><br />The suspect allegedly shouted “This is for Syria” as he launched the attack on three people.<br /><br />The Metropolitan police are investigating the stabbing in Leytonstone.<br /><br />A man believed to be 56 suffered knife wounds that were serious but not believed to be life-threatening, while two other people sustained minor injuries in Saturday’s attack.
