SIA said, however, that the substance found on the Boeing 777 was harmless. A replacement plane ferried the passengers to their destination.
"Ground staff at Singapore Changi Airport had discovered a white substance in the cargo hold of SQ806, a Singapore Airlines Boeing 777 with 276 passengers and 16 crew onboard," SIA said in a statement.
The aircraft had been due to depart for Beijing at around 3:45pm local time (0745GMT).
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