Interstate 55 is closed in both directions between I-270 and Meramec Bottoms Road after a three-alarm tractor-trailer fire.
Hazmat crews were dispatched to the scene around 12:30 p.m. Tuesday.
Three taken to hospital released, chemical still not identified
One officer hospitalized
Initial reports involved an explosive gas
Residents near the Chemisphere plant are being allowed back into their homes; fire crews looking for hotspots, cause
Fifty fire and police respond
Caseyville residents told to ‘stay put’