Thai Group Proclaims a Coup; Takeover Denied by Government
Army Deputy Comdr Gen Prasert Thommasiri seizes official radio stations and announces Govt takeover; Adm Sa-ngad Chaloryu, leader of Oct '76 mil coup, in separate radio broadcast, denies coup and says Govt is controlling situation; 24-member governing junta calls coup illegal and urges Army to resist; foreign news agencies' communications lines are cut; Bangkok is calm despite unconfirmed repts of minor resistance; Thai radio broadcasts order forbidding all troop and police movements; Prasert's ties to former Gen Praphas Charasatien, who was overthrown in '73 student-led rebellion, noted; Praphas returned from Taiwan exile in Jan and may be seeking to regain power (M)