German prosecutors investigating a weekend knife attack on a truck driver said on Wednesday that they were looking into a possible Islamist motive. The decision was based on a call of “Allahu Akbar” apparently made by the suspect and heard by two of the witnesses interviewed, they told dpa. They also revealed that the suspect was a German of foreign origin. Prosecutors in the state of Brandenburg are investigating the attack, which took place at a motorway service area in Hennigsdorf on the western outskirts of Berlin on Saturday evening. In the attack, a 57-year-old trucker suffered life-thre…