SAN LEANDRO (CBS SF) — Firefighters battled a massive 2-alarm fire early Monday that erupted at a Georgia-Pacific Paper Plant in San Leandro.

Authorities said approximately 50 firefighters responded to a structure fire at the plant located at 2800 Alvarado Street late Sunday with the blaze elevated to 2 alarms at 11:14 p.m.

READ MORE: SF Citizen Detective Finds Her Missing License Plate on Identical Car Stolen From Another Resident

Arriving firefighters were forced by the intensity of the fire to take a defensive approach to the firefight as the blaze raged into early Monday morning.

READ MORE: Caltrans Predicts Highway 37 To Be Permanently Flooded by Mid-Century; Seeks Solutions For Vital Corridor

Georgia Pacific officials said the fire was burning in an outdoor storage area.

MORE NEWS: Jewelry Thieves Trick Victims In Union City With Bait-and-Switch Technique Used In Similar Robberies

Shortly after 6:30 a.m., Georgia-Pacific wrote on Twitter that the fire was out, and the “facility expects to start back up this morning as
scheduled. Thanks to all first responders who helped.”