Police will review whether upcoming marches will go ahead after the national terrorism threat level was raised to 'severe' on Thursday following the Golders Green stabbings . This includes a major demonstration planned by the Stop the War Coalition in London on May 16. The event is set to mark Nakba Day, commemorating the 1948 displacement of Palestinians during Israel's creation. Asked about marches due to take place in the coming weeks, head of Counter Terrorism Policing Assistant Commissioner Laurence Taylor said on Thursday: “As part of our review into the change in the threat level, policing will be reviewing all events across the country.…