(CNN) -- Three workers were unaccounted for after an explosion Tuesday at a Raleigh-area food plant, officials said.
The explosion, reported about 11:30 a.m., caused sections of the roof to collapse at the ConAgra Foods plant in Garner, North Carolina, police spokesman Joe Binns said at press conference.
Rescuers were looking inside the plant for three workers who were missing, Binns said. At least 20 people were transported to area hospitals, he said. No fatalities were immediately reported.
"There was no warnings, no signs," Garner Mayor Ronnie Williams said. "It all happened very abruptly."
The incident was "not totally contained," Binns said. A small fire continued to burn at the plant.
The cause of the blast was unclear, Binns said.
Video from the scene showed holes in sections of the roof of the 50,000-square-foot plant. First responders set up a makeshift triage
Tags: workers, missing, food, plant, explosion, ConAgra, 20 injured, Garner, North Carolina
Location: Garner, North Carolina, United States (load item map)
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