COOLIDGE — Authorities are investigating a fire that happened at Arizona Development Services, a marijuana cultivation facility.

The Coolidge Fire Department responded to the facility around 6:51 p.m. on Sunday, The Casa Grande Dispatch reports.

Fire Chief Mark Dillon says the call initially came in as a fire caused by a lightning strike, but crews later discovered that the fire was actually coming from an internal source.

Fire officials say the materials led to an explosion within the building.

No one was inside the building at the time of the incident.

Crews managed to put out the fire shortly after 7:30 p.m., but that was not before it managed to do significant damage to the structure.

Dillon says initial damage estimates will likely be in the range of $100,000.