The plane turned back and landed before the right engine of the Boeing 777 burst into flames.
All 222 passengers and 19 crew on board were safely evacuated.
"We were in the air for roughly an hour before we began to smell gas," Chuan, a passenger on board with his wife told the BBC.
"The pilot came on the intercom and said that there was an oil leak in one of the engines and that they were going to turn and go back to Singapore."
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