(Phoenix Fire Department Photo) (Phoenix Fire Department Photo) (Phoenix Fire Department Photo) (Phoenix Fire Department Photo) (Phoenix Fire Department Photo) (Phoenix Fire Department Photo) (Phoenix Fire Department Photo)

PHOENIX — At least 100 firefighters in the Valley worked to extinguish a hotel fire in north Phoenix Tuesday evening, authorities said.

Fire personnel received reports around 5 p.m. of a blaze in the ballroom at the Westin Kierland Resort and Spa hotel, the Phoenix Fire Department said in a press release.

It was believed to be caused by construction workers when they were using a saw to modify a laundry duct, which cut the roof and spread sparks into the building, fire personnel said.

Firefighters from Phoenix, Scottsdale and Glendale responded to the incident.

Residents were temporarily evacuated from the building while crews worked to extinguish the blaze from the interior and exterior.

The fire did not extend to the living area of the hotel and guests were allowed to return to their rooms.

No injuries were reported as a result of the fire.

An investigation remains underway to determine the exact cause of the fire.