Maoist rebels who have cut off Kathmandu for three days attacked security forces and bombed buildings inside the Nepalese capital yesterday, as the government partially agreed to guerilla demands for lifting the blockade. The government said it would investigate and make public within 30 days the whereabouts of an unspecified number of leftist activists who have disappeared in the Himalayan kingdom's increasingly deadly civil war. The acceptance of a key rebel demand came after the blockade, which has been enforced mostly through fear, turned violent for the first time. Two rebels opened fire on police and soldiers guarding Kathmandu's Land Registration office soon after the building was badly damaged by a bomb, said Deputy Superintendent of Police Ganesh K C. The rebels then fled. One police officer was injured in the attack and taken to hospital where he was in serious condition, the superintendent said. Another bomb exploded at an empty police post on the outskirts of Kathmandu and caused no injuries, police said. The Maoists, who have taken over vast swathes of the countryside in their eight-year war to overthrow the monarchy, announced the blockade of the capital after their threats, including a bombing at a top hotel, led some 24 major companies to shut down. Information Minister Mohammad Mohsin appealed for normalcy in Kathmandu and said the government would probe the whereabouts of missing Maoists and trade union activists. **PHOTO CAPTION*** Soldiers guard the checkpoint out of Katmandu, Nepal, Saturday, Aug. 21, 2004. (AP)