Chimay police Chief Pierre Maton said early today that the blast was most likely "a gas explosion," but an investigation into the cause was ongoing.
The blast in the town of Chimay, 120 kilometers south of the capital Brussels, happened just after midnight local time.
Several dozen police and firefighters were on the scene and the area had been cordoned off, but the damage was not as serious as initially feared.
Windows were blown out of the two-story building, and one corner of the structure was badly damaged but there was no major collapse.
Chimay has a population of about 10,000 and is known for one of Belgium's most famous breweries.
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