United Airlines 747 returns to San Francisco after engine failure

SAN FRANCISCO -- A United Airlines Boeing 747 has returned to San Francisco after one of its four engines failed shortly after takeoff.KGO-TV in San Francisco said Monday that officials were responding to a report of an engine fire. A United spokeswoman said she could not confirm whether there was a fire.United says the plane with 202 passengers and a crew of 15 has landed safely.The flight was scheduled to go to Narita Airport in Tokyo. Instead the plane flew in several loops over the ocean bef