The Soviet-backed Afghan government began a cease-fire New Year's Day, but U.S.-backed Moslem rebels rejected the truce and attacked government troops in two villages, Afghan radio said.

The cease-fire offer was made Friday by Afghan President Najib, and the Soviet Union announced Saturday that its troops would join the truce.In a televised address to his nation Sunday, Najib complained that rebels have expanded operations against his government and repeated his offer of direct talks with them, Tass reported.