Cause determined for one of two fires at Saskatoon hotel construction site

Click to play video: 'Massive fire at a construction site in Saskatoon'
Massive fire at a construction site in Saskatoon
WATCH ABOVE: Saskatoon firefighters combat a massive fire on April 18, 2018, after two explosions reportedly happened on the top floor of the construction site – Apr 18, 2018

The cause of one of two fires at a hotel construction site this spring has been determined by Saskatoon Fire Department investigators.

On April 18, fire crews were called to the construction site on Lorne Avenue just before 6:30 a.m. CT. Massive flames, billowing smoke and even multiple explosions could be seen from the upper floors of the site. It took firefighters three hours to bring it under control.

Officials say the cause of the fire remains undetermined due to lack of evidence of a heat source.

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Firefighters were called back to the site less than a month later.

It is the second fire in just under a month at the construction site of the new Sandman Hotel in Saskatoon. Angie Mellen / Global News

The call came in around 9:30 p.m. reporting flames and embers on the northwest corner of the sixth floor. Crews stayed on scene for over 17 hours, and damage was estimated at $2,000.

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An investigation determined the fire was caused by grinding sparks which set fire to combustible construction materials on the site.

Construction has resumed at the site. The project is unique to Saskatoon as it’s one of the first six-storey, wood framed buildings in the city.

The site is set to be a new Sandman Hotel.

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