CULLISON, Kan. (AP) -- The American Red Cross says residents are being allowed back home after a chemical leak prompted the evacuation of the small town of Cullison in Pratt County.

The town was evacuated Friday as a precaution after a pickup carrying a tank of anhydrous ammonia on Highway 54 collided with another semitrailer.

KWCH reports (http://bit.ly/TKa9Ni ) the truck carrying the ammonia flipped and the container ended up the middle of the highway.

The highway was closed in both directions and residents were evacuated out of concern the tank might rupture.

The truck driver was hospitalized with critical injuries.