FISHER, Illinois (CNN) -- Officials say a fire at a natural gas plant in east-central Illinois is out after an explosion Saturday morning that required a nearby neighborhood to be evacuated.

Flames shot 400 feet in the air when a gas main exploded, said Steve Zehr of the Sangamon Valley Fire Protection District.

Fire officials say they had the blaze under control quickly.

But people who live within a one-mile radius of the People's Gas plant still have not been allowed to return to their homes. Zehr estimated about six homes were evacuated.

No injuries were reported. The explosion occurred in a gas storage well, Zehr said.

The plant is located near the town of Fisher, about 100 miles south of Chicago.