Counter-terrorism police in Britain on Sunday investigated a stabbing at a London Underground station in which a man brandishing a knife injured two people and reportedly said "This is for Syria."<br />Police arrested a 29-year-old man late Saturday and said they are treating the "violent unprovoked knife attack" at east London's Leytonstone subway station as a "terrorist incident."<br />Richard Walton , chief of Scotland Yard 's counter-terrorism command, said the decision was made because of information received from witnesses and subsequent police investigations.<br />Like many other European countries, authorities in Britain are already on edge after Islamic extremist attacks in Paris last month left 130 people dead.<br />Video shot by witnesses at the scene showed a pool of blood on the station's floor as the suspect was seen lunging at several police officers who tried to subdue him.
