Dozens of rescue workers spent hours battling a four-alarm warehouse fire early Saturday morning at Kaufman Products, a concrete company set in an industrial area of South Baltimore that backs up to trees and train tracks.

The business — a 40,000-square-foot, one-story, corrugated metal building filled with sand, paper, machinery and various non-combustible materials — caught fire shortly after 5 a.m., Baltimore Fire Department spokesman, Kevin Cartwright said.

The first wave of firefighters arrived at the location, on the 3800 block of Curtis Ave., about 5:30 a.m., finding "heavy smoke conditions coming from the entryway" of the warehouse, Cartwright said. They "established a water supply, forced entry into the building and performed a rapid attack on the fire, but the fire conditions continued to grow."

The incident commander ordered members to evacuate the building until reinforcements arrived. In total, more than 100 firefighters, paramedics, commanders and support staff responded, along with 35 fire apparatuses, including engines, trucks and specialty equipment, according to Cartwright. Aid came from Anne Arundel County as well, he said.

Several hours into the battle, there was an explosion inside the building, which could have been a barrel of paint thinner bursting, Cartwright said. No one was injured, though one firefighter was treated on the scene for heat exhaustion.

The blaze was under control by 9:30 a.m., Cartwright said.

tricia.bishop@baltsun.com

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