It quoted an “insider source” as saying Sunday's attacker in the southern city of Ansbach who wounded 15 people “was a soldier of the Islamic State” who had acted “in response to calls to target nations in the coalition fighting” Isis.
German authorities have identified the assailant as a 27-year-old failed Syrian asylum seeker, and said he had made a video pledging allegiance to the jihadist group.
The attack was the third in a week to rock Germany, after a shooting rampage in a Munich shopping centre killed nine people and an axe attack on a train wounded four.