DINUBA, Calif. (KFSN) -- An early-morning fire at the Ruiz Foods Plant in Dinuba is now contained as crews investigate how it started.
Firefighters were called to the facility on Alta Avenue near Avenue 416 just after 5:30 Thursday morning.
They believe the fire started in the building's air system.
Crews used ladder trucks to put out flames on the roof.
Ruiz Foods has been making frozen Mexican food in the South Valley since the 1960s, with items sold in grocery stores nationwide.
Officials say one person was treated for minor injuries and taken to the hospital as a precaution.
Crews were out all morning, monitoring the facility for any hot spots.
The cause of the fire remains under investigation.
EDITOR'S NOTE: The video above is from a previous broadcast and will be updated.