A fire broke out at SK hynix's Cheongju Technopolis industrial complex in North Chungcheong, injuring seven people as of early Monday.

A fire broke out at SK hynix's Cheongju Technopolis industrial complex in North Chungcheong, injuring seven people as of early Monday.

The leak of the toxic gas happened after a fire broke out, the official said, adding that the blaze has been contained.

SK Hynix evacuated 3,600 workers from its Cheongju chip plant after a fire triggered a hydrogen fluoride gas leak. Production was unaffected.

Five of the seven were suffering from eye irritation thought to be caused by fluorine gas.