SAN ANTONIO – An oven is the likely cause of a fire at a storage facility on the city's Northeast Side early Friday morning, San Antonio firefighters said.

The fire was called in just after 6:30 a.m. at the loading docks of GoodHeart Brand Specialty Foods in the 11100 block of Nacogdoches Road, not far from Wurzbach Parkway.

According to Battalion Chief Will Pritchett, smoke was showing from the exterior of the building when firefighters arrived and machinery was burning inside. The fire was extinguished by the building's sprinkler system, Pritchett said.

Fire crews entered through the back loading docks of the building. The damage done was to the oven that caught fire and possibly to some food, Pritchett said.

At its peak, according to the San Antonio Fire Department website, as many as 29 units answered the call. Roughly half of the 100 firefighters were not used, Pritchett said.

Fire crews are still working to remove water and smoke from the building. It'll take about another half-hour for the cleanup.

Nacogdoches Road at one point was shut down from Wurzbach Parkway  to Hillpoint. The road has since reopened.

There were no reported injuries.

This is a developing story. Stay with KSAT 12 both online and on-air for more information.