Firefighters are at the site and combating the blaze, said a Bandar Abbas fire official who ISNA identified only by the surname Aminizadeh.
The fire broke out in a fuel storage tank at the factory, Aminizadeh told ISNA.
A fire at an Iranian oil refinery in Tehran’s Shar-e Rey district killed six workers and injured two others last October.
Since sanctions were lifted in 2016 under a multinational nuclear deal, Iran has signed contracts with foreign firms to repair and modernize its oil refineries.
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