SQ806, bound for Beijing from Singapore, was scheduled to depart at 4.50 pm from Changi Airport, but tweets from passengers said that the plane was delayed due to discovery of a "suspicious white substance" in the baggage area.
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Twitter user Bernie Baker, a passenger on SQ806, posted a photo at 5.20pm which showed some white powdery substance in a lavatory.
At 5.49pm, he updated his status with "Yep...You guessed it. Plane is grounded. Gate is closed. Substance is unknown. Better safe..."
Another Twitter user by the name of Peter Lundberg posted a photo an hour later showing responders surrounding the plane.
A Singapore Airlines spokesperson confirmed the incident.
Said the spokesperson: "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, operating from Singapore to Beijing on 9 June 2014 at approximately 1545pm local time.
"The relevant authorities were notified and after investigating, concluded that the substance was harmless.
"An aircraft change was conducted and the flight departed at approximately 1920pm local time."