A twin-engine plane returning from a sightseeing flight clipped a radio station antenna and crashed into a university building Friday in heavy fog, killing all aboard, including eight U.S. citizens, the pilot and co-pilot, police said.

Three people on the ground were injured when the 10-passenger British Islander crashed about 5:15 p.m. into a building at the private San Martin de Porres university, police said. The plane was making an instrument landing at Lima's Jorge Chavez International Airport because of the fog, said an official at the airport, about 21/2 miles from the crash site.Other officials said the right wing hit a radio station antenna, sending the plane crashing into the tourism school, which was under construction. The names of the passengers were not available, but a police source said they all were U.S. tourists.