One person died and three were injured Thursday in an oil tank fire in Weld County.

Workers were doing maintenance on an Anadarko oil tank battery when the fire sparked at about 3:15 p.m. on a site near Colorado 66 and Colorado Boulevard, according to the sheriff’s office.

Black smoke streamed into the air and was visible from I-25.

When emergency personnel reached the site the “oil tank battery was fully engulfed in flame,” the sheriff’s office said.

An investigation into the cause of the fatal industrial accident is ongoing. None of the workers was identified Thursday.

Two of the injured workers were taken to North Colorado Medical Center in Greeley for burn treatment, and one was taken to Medical Center of the Rockies in Loveland.

The worker who died was found when deputies, Mountain View firefighters and Anadarko personnel combed the area.

Mountain View Fire Battalion Chief Roger Rademacher said one of the workers had serious injuries and the other two had moderate injuries.

Anadarko Petroleum Corporation is under scrutiny for owning a well linked to a deadly Firestone house explosion April 17.

The oil tank site is about 4 miles north of the Firestone house that exploded.

Mark Martinez and brother-in-law Joey Irwin, both 42, were killed in the Firestone house explosion. Erin Martinez was left badly burned.

No evacuations of nearby residences were ordered after Thursday’s fire. The fire department said there was no hazard for residents of the area.