Updated

Federal officials have fined U.S. Steel and a subcontractor a total of $175,000 for safety violations found after a coke plant explosion injured at least 15 workers.

The Occupational Safety and Health Administration announced Thursday it cited the companies following a probe of the July 14 explosion at the Clairton Coke Works near Pittsburgh.

OSHA (OH'-shuh) says the companies failed to provide effective energy control procedures and exposed workers to burns.

U.S. Steel was penalized $143,500 for two willful and 11 serious violations. Power Piping Co. was fined $31,500 for six serious violations.

U.S. Steel said in a statement that it is reviewing the citations. The company says it cooperated with OSHA and is committed to safety.

Power Piping declined comment.