Officials said they expected the death toll to rise.
When fire broke out the supervisors told the female employees to return to work but smoke soon filled the factory.
The Oklahoma explosion (caused by a detonated truck bomb) took 168 lives including 19 children, and injured 680 people.
Police managed to peacefully disperse the massive crowd. Firefighters responded to the alarms with trucks, ambulances, EMTs, and specially trained union members.
Deaths and injuries in the nation's mines, including its coal mines, fell in 2012 to some of their lowest recorded levels.