Ottawa Fire officials say they fought a blaze at a newly constructed portable classroom behind Samuel Genest High School in the east end early this morning.
They say calls came in reporting the fire just after 4 a.m.
Police, fire, paramedics, Ottawa Hydro, and Enbridge crews were all notified.
An Ottawa Fire inspector is responding now.
The cause of the fire is under investigation.
This comes as Ottawa Police are investigating a number of suspiciously-set fires in Vanier.
More to come.