A German police officer has died two days after being stabbed at an anti-Islam gathering in the western German city of Mannheim, authorities said Sunday, as police responded to demonstrations held in the wake of the attack. The public prosecutor’s office in Karlsruhe, the Mannheim police headquarters and the criminal investigation office in the state of Baden-Württemberg said 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. “We mourn the loss of a police officer who gave his life fo…