Suspected communist guerrillas dynamited a U.S. Navy relay facility in the northern Philippines, destroying a radar antenna and damaging a second antenna and a communications van, the military said Monday.

No one was injured in the series of five explosions at dawn Sunday at the relay station at Mount Santo Tomas, near Tuba in Benguet Province, 130 miles north of Manila, a Philippine military spokesman said.The attack was the first against a U.S. facility since communist rebels threatened to damage American installations and killed three U.S. servicemen in October 1987, charging they supported Manila's anti-insurgency campaigns.