GRANITE CITY, Ill. (AP) -- A reported explosion Thursday morning at a St. Louis area steel plant turned out to be little more than a big noise and a small fire.

Fire and emergency crews were called to Granite City Steel in Granite City, Ill., at around 10 a.m. after an explosion was reported.

But Granite City Assistant Fire Chief Tim Connolly said there was no explosion. Mill workers dropped a large amount of molten steel as they were putting it into railroad cars.

"It makes a terrible noise and the heat is tremendous," Connolly said. "It sounded worse than it was. By the time we got there, there was very little fire."

No one was hurt. Cleanup was under way.