A blast rocked the al-Shami water heaters factory in Bourj al-Barajneh on Monday, the state-run National News Agency reported.
It added that the explosion left four people dead.
The agency did not specify the cause of the blast, but local media said a water heater had exploded.
Local television stations broadcast footage showing damage to vehicles parked outside the factory, and a video circulating on social media appeared to show three bodies on the building's blood-soaked floor.
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