CINCINNATI: Fire officials say two people have been burned, one seriously, in an overnight explosion and fire at a hazardous waste treatment facility in Cincinnati.

It happened at about 3:45 a.m. Friday at Environmental Enterprises Inc. Fire officials say workers were shredding contaminated filters when a chemical apparently caused a flash fire. A sprinkler system helped put out the fire, and Cincinnati firefighters checked to make sure local air quality was clear.

Two people were taken to a hospital with burns. Fire officials say one man was badly burned; the otherís burns were minor but required treatment.

The companyís website states that it specializes in industrial and hazardous waste management and disposal and other services. A message was left Friday morning for comment.