Russia sect holes up in cave to await end of world Thu Nov 15, 2007 10:53am GMT [] [] By Tatyana UstinovaMOSCOW (Reuters) - At least 30 members of a Russian doomsday cult have barricaded themselves in a remote cave to await the end of the world and are threatening to commit suicide if police intervene, officials and media said on Thursday."They have covered the entrance and refuse to come out and are threatening to blow themselves up," an official in the local prosecutor's office told Reuters by telephone. "They threaten to detonate a gas tank...