DUISBURG, Germany — A stampede inside a tunnel crowded with techno music fans crushed 15 people to death and injured dozens at the Love Parade festival in western Germany on Saturday. Other revelers initially kept partying at the event in Duisburg, near Duesseldorf, unaware of the deadly panic that started when police tried to prevent thousands more people from entering the already-jammed parade grounds. Police are still trying to determine exactly what happened at the event that drew hundreds of thousands of people, but the situation was "very chaotic," police commissioner Juergen Kieskemper said. He said just before the stampede occurred at about 5 p.m.