SABOTEUR BLAMED FOR PEKING BLAST
Chinese Govt on Apr 30 blames counterrevolutionary saboteur for explosion outside Soviet Embassy, Peking, that USSR Govt says killed 2 Chinese soliders; statement adds to speculation of continuing pol unrest in wake of leadership changes and pol violence in Peking; 'counterrevolutionaries' is China's jargon for serious lawbreakers and is normally used only for Chinese; 2 Western diplomats say they were informed by Soviet envoys that blast was caused by bomb and occurred when group of Chinese were stopped by guards as they tried to enter embassy compound; incident described; Soviet Amb Vasily S Tolstikov tells diplomats that he saw 2 killed and 1 wounded in incident but adds few other details, speech; Western envoy says Soviet sources appear to regard blast as work of extermists and appear surprised and worried; Hua makes no mention of incident when he delivers typically tough anti-Soviet speech on Apr 29; extra troops and plainclothes security men guard embassy (M)

