A plane carrying relief supplies to Nicaraguan rebels in Honduras crashed on a mountainside as it was preparing to land near the Honduran capital of Tegucigalpa. All 10 people on board were killed, authorities in Tegucigalpa said. The DC-6, rented by the U.S. Agency for International Development, crashed about 17 miles north of the capital. Authorities said the victims included three Nicaraguans and six Hondurans. The 10th victim was severely mutilated and his nationality could not be immediately determined. The cause of the crash was unknown. Meanwhile, in Managua, Nicaraguan President Daniel Ortega was quoted by a government official as saying the Sandinistas would “abandon power immediately” if they lost the February, 1990, presidential election.