Ancient Indian beliefs and multinational business were on a collision course as Colombia's U'wa tribe threatened to commit mass suicide after a U.S. oil firm won drilling rights to disputed ancestral lands yesterday. "We are looking at the information to see what action the community will take. Mass suicide is one option we are considering," Evaristo Tegria, a spokesman for the U'wa tribe, told Reuters by phone from Cubara, the main town on the tribe's reservation.