A British Airways Boeing 747-400 carrying 180 passengers hit a building at a South African airport, injuring four workers in the building, officials said. The injuries were not serious and no one on the plane was hurt, officials said. The aircraft, which damaged one of its wings, struck the building at O.R. Tambo International Airport in Kempton Park. Airports Company South Africa said the plane clipped the building late Sunday as it prepared to depart for London, the South African government news agency SAnews.gov.za reported. The four people injured were ground-crew employees who were in the building. The aircraft was moved to a remote location at the airport. Service at the airport was not disrupted, officials said.