Emergency services are at the scene of a train derailment Thursday morning on Montreal's south shore, where they are urging citizens to stay away from the area.

Water vapour pouring off the derailed CN train in Longueuil -- police have asked those in the area to stay inside, saying they don't know whether the fumes are safe. The fire department is on the scene, dousing the train as a precautionary measure. @mtlgazette pic.twitter.com/2hiId0liEV

People in a part of Longueuil, Que. were being asked to stay indoors with their doors and windows closed on Thursday morning after a train derailed in a train yard, spilling an unknown quantity of hydrogen peroxide.

A freight train derailed in Longueuil, Que., on Montreal's South Shore, Thursday morning, sparking concerns about a chemical spill and sending a cloud of white smoke drifting toward a residential area.

The City of Longueuil has partially lifted the confinement measure currently in effect around the site of a CN train derailment near Jacques-Cartier West Boulevard and Saint-Georges Street after the incident spilt an unknown quantity of hydrogen peroxide Thursday morning.

People in a part of Longueuil, Que., were being asked to stay indoors with their doors and windows closed on Thursday morning after a train derailed, spilling an unknown quantity of hydrogen peroxide.

Longueuil police say it doesn’t initially appear anyone was hurt, but fire officials are dealing with a hydrogen peroxide spill

Emergency services are at the scene of a train derailment Thursday morning on Montreal's south shore, where they are urging citizens to stay away from the area.