A fire at a construction business in Warrenville has been ruled accidental, authorities said Monday.

The fire began about 10:30 p.m. Friday on the 30W200 block of Butterfield Road, when firefighters were alerted that something was wrong by an automatic alarm, Warrenville Fire Protection District Assistant Chief Andy Dina said in a news release.

The first crews made it to the scene six minutes after the alarm, then called in extra forces, Dina said.

Once a structure fire response team assembled, including personnel from the Warrenville fire district, West Chicago Fire Protection District, Wheaton Fire Department, Winfield Fire Protection District and Warrenville Police Department, crews brought a hose inside to extinguish the fire.

Dina said an automatic fire sprinkler system kept the blaze in check until firefighters arrived. He said crews put out the fire quickly, then ventilated the building and checked to ensure the flames hadn’t spread to adjoining units. No one was injured.

Investigators on Monday wrapped up their interviews and their probe into the cause of the fire, determining it was accidental, Dina said.