Transit police have just confirmed the device on the skytrain tracks was an explosive.
They can't say what damage if any it may have caused if it had detonated on the tracks.
RCMP bomb experts will detonate it for safety.
Transit police are now trying to determine a motive after the explosive device was found on skytrain tracks in Surrey.
Spokesperson Anne Drennan describes the device spotted by a skytrain passenger.
"It looks like it is either a small fire extinguisher or a small propane tank it has straps and wires sticking out of it and it is lying right on the track area between Scott Road station and Gateway station."
When asked how the device could have been placed on the track Drennan said "It is possible it could have been thrown up onto the tracks that is not impossible I am told. We are not sure at all of course at this point as to how it got there."
She says police are reviewing surveillance video.
Skytrain is now running again between Scott road and Gateway stations.
Police are appealing for witnesses.
Drennan says if anyone on King George Boulevard or on skytrain saw anything suspicious in the area today they can call police at 604.516.3500