58 U.N. hostages boarded a bus in Pale, headed for Serbia, asBosnian Serb leaders promised to release more of the approximately 200 peacekeepersstill held hostage in the coming days. U.S. forces, meanwhile, moved military helicopters and troops into positions closer to Bosnia in case they are called upon to rescue the peacekeepers. Bosnian Serbs continue to demand that NATO renounce further air raids, but NATO refuses to bargain.TIME U.N. correspondent Bonnie Angelosays "The West can't bargain on this. The Bosnian Serbs are in this cat-and-mouse game they can't win unless we let them off the hook." The challenge now is for the U.N. to arrive at some sort of diplomatic solution, which will not be easy. "The U.N.'s credibility has been shattered by this whole situation," says Angelo, "but I don't know how they could have avoided the situation. If thepeacekeepershadn't gone in, people would be witnessing this horrible slaughter and blaming the U.N. for it."