Germany’s Love Parade turned tragic Saturday as a stampede erupted inside a tunnel, leading to the deaths of at least 19 people and injuring 340. No one is quite sure yet what sparked the panic at the techno music festival in the western city of Duisburg, but the scene was so chaotic that many people kept partying on the grounds for some time after the stampede began. “There were piles of injured on the ground, some being resuscitated, others dead and covered with sheets,” one partygoer said. “It was way too full in the afternoon. Everyone wanted to get in.” Because of the crowds, rescue workers were slow to reach the victims. “The people literally trampled each other on the way into this tunnel,” said a German television report.