Law enforcement tells FOX 44 News that one person has died in an 18-wheeler crash in Falls County.

Authorities blocked off a large area around FM 1240 and FM 147 in Falls County because of the crash Friday afternoon.

Authorities say the truck hit a large tree branch, which caused ammonia to leak.

Two people were injured, including a Falls County Deputy. A helicopter airlifted one person to a hospital.

People are being asked to avoid the area and homeowners are being asked to stay inside. Authorities will be watching the area for 24 hours to make sure the air is safe.

FOX 44 News has a crew at the scene and will bring you more information as it becomes available.