The U.S. military has sparked criticism in Australia after dropping four unarmed bombs on a protected natural park. Two U.S. jets were forced to dump the explosives when their training mission was canceled and they needed to lose the extra weight to conserve fuel. The inert bombs were dropped on the Great Barrier Reef Marine Park, a highly sensitive environmental area. The U.S. Navy says it is planning a mission to recover the bombs. Environmentalists and antiwar activists had already been protesting the training missions, which come as part of annual U.S.-Australian war games. Larissa Waters, an Australian senator, said: “Have we gone completely mad? Is this how we look after our World Heritage area now — letting a foreign power drop bombs on it?”