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There was, however, no casualty, police said, citing preliminary reports.
At least 30 fire tenders have been trying to put out the blaze, which broke out around 7 pm.
Workers, who were in the unit, managed to rush out as soon as the fire broke out, some of the workers said.
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Two persons, who felt uneasy after inhaling the fumes, have been hospitalised.
People living nearby are being evacuated.