ROCKVILLE- Six people were transported to a hospital after they were exposed to carbon monoxide Saturday morning in Rockville, said fire officials.
It happened at a construction site on 15200 Omega Drive near Research Boulevard.
Authorities believe the cause of the elevated levels were due to workers operating propane powered equipment in an area of the building that wasn't properly ventilated.
Montgomery County Fire and EMS evaluated nine workers. At least six were transported to a nearby hospital with non-life threatening injuries.