A Boeing 777 that was en route to South Korea landed safely at Seattle-Tacoma International Airport after its crew reported flames shot out of one of the two engines.

Airport spokesman Perry Cooper said Asiana Airlines Flight 271 turned around soon after takeoff Wednesday afternoon. Witnesses on the ground reported hearing explosions.

Cooper says it's unclear what might have caused the flames. The plane dumped fuel over Puget Sound before landing.

Airport spokeswoman Terri-Ann Betancourt said there were no flames or fire when the plane landed, and it taxied under its own power.

The flight was headed to Seoul. Betancourt said 179 passengers and crew were on board.