Former Head of Counter Terrorism Chris Phillips has criticised the police for “not taking threats seriously”, after one of the UK’s major football stadiums was threatened by Islamic State. Fans attending last night’s football game at Arsenal’s Emirates Stadium in London were urged to “be alert”, after a sinister image was shared by the Al Ayn Foundation, a media channel linked to the terrorist group. Just weeks after they killed hundreds at a concert hall in Moscow, the group have threatened to target four more venues, including Arsenal’s home ground. The Met Police said that they are “aware o…