Tributes flowed in for a German police officer who died on Sunday, two days after being stabbed at an anti-Islam gathering in the western German city of Mannheim. The officer underwent emergency surgery immediately after the attack and was placed in an induced coma, but succumbed to his severe injuries on Sunday afternoon, according to the public prosecutor’s office in Karlsruhe, the Mannheim police headquarters and the criminal investigation office in the state of Baden-Württemberg. The German chancellor and president were among those to express shock and dismay at his death. “I am deeply sho…