Emergency crews are working to get control of a fire at the KMCO plant on Tuesday in Crosby Texas, about 25 miles northeast of Houston.

According to Harris County Sheriff Ed Gonzalez, two people may be injured and Highway 90 is shut down in the area.

School children have been told to take shelter and the air conditioning is being shut down to reduce exposure to toxins in the air.

Some residents say they felt their homes shaking before seeing a thick column of smoke rising into the air.