A US tourist was killed and four people suffered life-threatening injuries when their hot air balloon crashed Tuesday, police said in Fribourg, Switzerland. The hot air balloon carrying the man, his wife, their two daughters and a Swiss pilot was about to land in Montbovon, in western Switzerland, when it touched a high-voltage power line, dpa reported. The balloon plunged to the ground some 40 metres below. Rescue workers tried to resuscitate the tourist, but he died at the accident site.