FRIDAY 6/18/21 4:40 p.m.

SALT LAKE CITY (ABC4) – According to the Unified Fire Authority, investigators from the U.S. Department of Justice as to the cause of the fire that raged in a Brickyard-area construction site have been called in to assist. Agents from the Bureau of Alcohol, Tobacco, Firearms & Explosives, reporting to the Denver Field Division and working out of the Salt Lake City office will lend their expertise to the investigation.

ORIGINAL STORY: Massive Millcreek structure fire under investigation, witnesses recount scene

WEDNESDAY 6/16/21 5:37 p.m.

SALT LAKE CITY (ABC4) – Investigators are working to determine what caused a three-alarm structure fire in Millcreek Wednesday evening.

According to Patrick Costin with Unified Fire Authority, shortly after 5 p.m., over 60 firefighters from six different agencies responded to several reports of a structure fire near 3300 S. Highland Drive.

When firefighters arrived, massive flames could be seen on multiple sides of a building under construction.

Officials expressed concern that the building may collapse due to damage from the flames as firefighters battled the fire from a safe distance.

It is unknown if any people were inside the building when the flames erupted.

Witnesses describe what it was like to see the flames tower into the sky Wednesday afternoon.

Cell phone video footage taken on the scene shows smoke and flames towering over the area as cars drive by.

While no firefighters were injured, one person was taken to the hospital due to injuries from the fire. Their condition is not known at this time.

Power lines are down in the area of the fire. According to Rocky Mountain Power, an outage in Millcreek affected over 2,500 people. As of Thursday morning, power has been restored.

The cause of the fire is under investigation.

This is a developing story. It will be updated as more information becomes available.