Opposition leaders were out of sight and believed to be under house arrest. Witnesses said security men dragged away G.P. Koirala, leader of the Nepali Congress, and Madhav Kumar Nepal, head of the Nepal Communist Party-United Marxist and Leninist Party, Tuesday when they emerged from their homes to try to speak to reporters. Opposition leaders were out of sight and believed to be under house arrest. Witnesses said security men dragged away G.P. Koirala, leader of the Nepali Congress, and Madhav Kumar Nepal, head of the Nepal Communist Party-United Marxist and Leninist Party, Tuesday when they emerged from their homes to try to speak to reporters.