SARAJEVO, Bosnia-Herzegovina - A plane carrying Macedonia's president to an international investment conference in Bosnia disappeared from radar, U.S. peacekeepers said Thursday. The Macedonian government aircraft, carrying President Boris Trajkovski to the conference in the western Bosnian city of Mostar, lost contact with air-traffick controllers near the border between Bosnia and Montenegro, said Capt. Ben Thorp, a spokesman for U.S. peacekeepers in Bosnia. Officials said it was too early to determine whether the plane had crashed.