REPORT ON ATTACK AWAITED AS NIXON MEETS KEY AIDES
Nixon calls meeting of his leading mil and diplomatic advisers at White House, apparently to rev progress of major new allied operation under way in northwestern S Vietnam; announcement may be forthcoming on details on operation; White House spokesman only confirms meeting takes place and that it is attended by Rogers, Laird, Adm Moorer, CIA Dir Helms and Nixon aide H Kissinger; declines to confirm or deny repts that meeting was called to decide on whether S Vietnamese troops, supported by Amer air power, will strike across Laotian border; informed sources rept decision to order such a strike is up to Nixon; Cong sources say operation was launched last weekend and involves about 25,000 S Vietnamese and 9,000 Amer troops; Sen Foreign Relations Com, frustrated by news blackout, asks Nixon Adm to provide rept as soon as possible; agrees to petition Rogers and Laird to discuss new action in pub sessions 'as soon as security considerations permit'; Fulbright comments; State and Defense Dept spokesmen continue official silence on mil operations; Scott confirms major allied assault is under way in northwestern S Vietnam; estimates operation will run from 7 to 10 days; heavy Amer bombing of Ho Chi Minh Trail is reptd for 117th consecutive day; Japanese news agency repts from Saigon that 4,000 to 5,000 S Vietnamese airborne troops have already been airlifted into the Boloven Plateau in southern Laos; USSR pub echoes rept; charges major force of S Vietnamese troops 'under direct command of Amer officers' has invaded Laos; several Sens, including Cooper, ask Adm about repts; are told no S Vietnamese troops have as yet entered Laos; Sen Aiken says he has been assured by Rogers's office that Cong ban against use of Amer ground troops in Laos will be respected; says he still does not know what is happening; Laird confirms no Amer troops will be used in Laos; denies substance of USSR rept; map

