SAIGON-America's supersonic jet bombers turned to targets in Laos and Cambodia on Sunday after battering air defenses and supply depots in North Vietnam in the biggest air campaign in seven months.
Striking from aircraft carriers in the Gulf of Tonkin and air bases in Thailand and South Vietnam, as many as 400 Air Force and Navy combat planes took part in the raids across wide areas of Indochina.
Bombers pounded North Vietnam from midnight until dawn, the deadline set by the Pentagon for completing what it called a series of retaliatory strikes against missile and antiaircraft gun positions and supply depots.
The attacks were the heaviest since May and the deepest since the limited bombing halt was announced more than two years ago.
One source estimated that more than 200 U. S. warplanes took part in the raids-over North Vietnam, with an equal number attacking supply depots across the border in Laos.
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