Bosnian Defense Ministry sources toldTIME's Edward Barnesthat Serbs have captured the beseiged mountain enclave of Zepa, the second U.N. "safe area" targeted inthe rebels' violent march through the Muslim region. The sources told Barnes that Muslim civilians -- rather than army units -- in the town had surrendered. Speaking to diplomats in Zagreb by telephone from Washington, the U.S. ambassador to Croatia, Peter Galbraith, said he had "a preliminary report" that Zepa had fallen, according to the Associated Press. Under the terms of surrender, Barnes says, the Serbs will move about 30 heavily-wounded Muslim residents to Sarajevo on Thursday. Though the Serbs reportedly captured, killed or tortured men in their conquest of Srebrenica, the other "safe area," last week, they have promised to move all Zepa residents to the nearby town of Klandanj. That pledge may be meaningless: "The soldiers will try and escape," Barnes says. "The rumors from Srebrenica are that the soldiers being held in detention are really being mistreated and killed. The Serbs say any Muslims who want to leave can leave, but there is no reason to believe this will be any different."