A Philippine Communist rebel said that preparations are being made for the assassination of U.S. Ambassador Nicholas Platt and warned that the rebels will strike at the first opportunity. In an interview with United Press International, a spokesman for the Alex Boncayao Brigade, a Manila-based urban guerrilla group of the New People's Army believed responsible for a series of assassinations in the capital last year, said the United States was "intervening more and more" in the Philippines' internal affairs. The U.S. Embassy said American officials are "taking these threats seriously," a spokesman said. "But, we're not going to pull out or anything."