The Ottawa Police Arson unit is looking into a fire in Vanier, calling it suspicious.
Ottawa Fire crews were called to 155 Longpré St. just before 5:00 a.m. Thursday.
The home was vacant and appeared to be under construction.
Firefighters saying flames were heavy on one side of the house upon their arrival, and they are now undertaking a defensive operation.
A second alarm was called in shortly after crews arrived on the scene.
No injuries were reported, but additional crews had to be brought in, due to the extreme weather conditions.
A fire investigator has been dispatched to the scene to determine the cause.
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Fire crews were kept busy Friday morning with a second fire in the east end, this one coming from an underground parking lot at 240 Brittany Dr.
Fire officials say a city worker called them just before 4:00 a.m., reporting smoke coming from the parking lot. Firefighters discovered a fire and steam upon their arrival, and quickly put it out.
They say the smoke made accessing the area difficult.
No injuries were reported, and a fire investigator is allegedly not required for this incident.