A 29-year-old policeman stabbed on Friday in the German city of Mannheim during an attack on a right-wing demonstration has died, authorities said on Sunday. The attack was carried out by a 25-year old man with a knife, who severely injured six individuals, according to police in the German state of Baden Wuerttemberg, where Mannheim is located. "He stabbed the police officer several times in the head," the police statement said, adding the officer underwent emergency surgery immediately after the attack and was placed in an induced coma but succumbed to his injuries on Sunday.