SAN FRANCISCO—United Airlines Flight 837 headed towards the Narita International Airport in Tokyo experienced unexpected engine problems on Monday, November 28 at approximately 11:36 a.m. The technical difficulty caused a “loud boom” overheard by passengers on board and even some San Bruno citizens. The flight was carrying 202 passengers and 15 crew members before it made an emergency landing in San Francisco.

According to reports, the sound of the engine failing—which was later identified as a ‘compressor stall’ by United Airlines Spokesperson, Erin Benson. It was heard shortly after takeoff near the San Francisco International Airport/San Bruno area. SFO officials stated that one of four engines had to be shut down in response to the technical difficulties. Though the plane was without one engine, the plan was able to be safely landed with the remaining three engines.

Sam Smith, a resident of the Bay Area tweeted, “The @united flight out of @flySFO had flames coming out of left side engine, made loud bang noise, and then looked like it was going to land.”

The plane circled for 2 hours near Santa Cruz before making an emergency landing at approximately 1:30 p.m. at the SFO airport. There were no reports of any injuries sustained by passengers or crew on board.

The flight was rescheduled to Tokyo at 4:30 p.m. on Monday.