GUNFIRE FLARES; Relations Severed Till Pacts Are Altered, Chiari Asserts
Chiari says ties with US will remain severed until there is 'complete revision' of canal treaties, radio s; says he talked with Johnson by phone, both agreed to end fighting; 3 US soldiers reptd among at least 20 killed and 'several hundred' hurt in riots; Panama City mobs force evacuation of US Embassy; most Amers in Panama moved to CZ for safety; US charge d'affaires Stuart takes refuge in residence of Uruguayan amb after own residence is set afire; Asst Sec Mann and Sec Vance arrive, CZ; Mann says Johnson regrets tragic events, is determined to resolve differences; both conf with Chiari and Panama Min Solis; further details on violence; O'Meara denies repts US troops moved out of CZ; says they conduct holding action; Chiari declares day of natl mourning; clandestine Panama broadcasts urge new attacks in CZ; canal shipping unaffected; several US-occupied bldgs in Panama burned; maps; illus of riots and damage
