A woman has stabbed and injured six people on a bus in the western German city of Siegen. Police said the 32-year-old suspect is a German national and was arrested after the attack. At least 40 people were traveling on the bus at the time of the attack. Local authorities said at least three of the victims sustained life-threatening injuries. Police are trying to establish a motive for the attack but say there are no indications it was terrorism. This incident comes a week after a deadly knife attack in Solingen that left three people dead and eight others seriously wounded. The suspect is a 26…