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Ottawa police arson squad has joined the Ottawa Fire Services investigation and the Ontario Fire Marshal’s Office in the probe of a three-alarm blaze at an early morning at St. Francis of Assisi School in Orléans early Tuesday.

The Ottawa Catholic School Board confirmed Tuesday that a re-roofing project had begun at the school at 795 Watters Rd.

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Damage is estimated at $1 million. There were no injuries.

Ottawa fire got a string of 911 calls just after 2 a.m. reporting visible flames on the roof of the school. Within minutes, they declared a second-alarm and it was a three-alarm fire by 3 a.m.

“Due to the size of fire and inflation of the roof with propane tanks exposed this became a defensive attack,” the fire department reported of the blaze east of Charlemagne Boulevard and Tenth Line Road.

The fire was running through the school’s duct work, firefighters reported.