An explosion occurred at the Goodyear Houston chemical plant based in Akron, Ohio, on Wednesday morning killing one worker and injuring six other.

Rescue workers found the dead man while searching through rubble, but after seven hours of searching. The blast occurred at 7:30 a.m. in a heat exchange unit at the plant according to the plant’s spokesman Scott Baughman. The six injured workers received medical treatment at the site of the explosion and then were taken to local hospitals for evaluation.

"During our first safe opportunity, we discovered a body under some debris," said Baughman

A small leak of ammonia was also caused by the blast. The substance was used at the chemical plant to refrigerate processed liquids. The ammonia spill was contained in a small area of the plant which manufactures synthetic rubber for the production of tires.

Almost 200 workers were in the plant at the moment of the incident and were all evacuated for a couple of hours by the authorities. At about 11 a.m., the employees were allowed to enter the plant again. However, the area near the blast remained closed.

An investigation into the explosion was started by authorities, who said the incident posed no danger to the public. Investigators are still trying to find out what caused the explosion and how much ammonia was spilled.

The explosion happened in one of the facility’s three heat exchanging units, which are about 2 feet wide and 15 feet long.

The name of the worker who died wasn’t released.