SOLINGEN, Germany (AP) — Authorities say an attacker with a knife killed three people and seriously wounded at least five late Friday at a festival in the western German city of Solingen. Witnesses alerted police shortly after 9:30 p.m. Friday to an unknown perpetrator having wounded several people with a knife on a central square, the Fronhof. Police say the attacker is on the run, and they so far had only very thin information on the assailant. The “Festival of Diversity” began Friday and was supposed to run through Sunday. It was meant to mark the city’s 650th anniversary with several stages in central streets offering attractions such as live music, cabaret and acrobatics.