BOSNIA . . . A TRUCE WITHIN A TRUCE

A threat to thetenuous cease-fire in Bosniawas removed today when the Muslim-led government agreed to withdraw its troops from a Sarajevo demilitarized zone, United Nations officials said. The presence of the government troops in the area had prompted the government's enemies, the Bosnian Serbs, to block supply lines to Sarajevo and was threatening to derail the five-day old truce.