Mississippi ? An explosion tore through a paper mill Saturday after a boiler was inspected, killing a contract worker and injuring 17 others, the company said.

The explosion occurred as a boiler at the International Paper mill was being started after an annual maintenance shutdown in Redwood, about 30 miles west of Jackson, company spokeswoman Amy J. Sawyer said in a statement.

“We have accounted for all IP employees, and no employees were hurt. An investigation will be conducted to determine the cause of the accident,” Sawyer said.

No details were available about the contractor who was killed, Warren County deputy coroner Kelda Bailess said.