Hanoi is reported to be holding air-raid drills for fear of more U.S. attacks in the wake of the Pierce Arrow retaliatory raids that had been flown in response to the Gulf of Tonkin incident.
The North Vietnamese government urged all civilians with nonessential posts to leave the city. In ground action, ARVN troops ambushed a Viet Cong unit south of Saigon. Meanwhile, Viet Cong guerrillas attacked three hamlets in the Vinh Binh Province along the coast in the Mekong Delta. A U.S. helicopter crashed 50 miles northwest of Saigon, killing three U.S. airmen.