IDAHO FALLS, Idaho (AP) — The U.S. Department of Energy has unveiled details about an Idaho National Laboratory worker's burn injuries that were missing from a contractor's earlier report.

The Post Register reports the researcher received second- and third-degree burns to 10 percent of his body on Feb. 11 when hot steam and salt were forced out of a container and into the experiment enclosure where he was working. Battelle Energy Alliance, the contractor in charge of INL, didn't disclose the severity of the burns when it issued the first report on the incident.

But an Independent Activity Report subsequently posted on the Department of Energy's Office of Health, Safety and Security website provided more information, the newspaper reported Tuesday. The investigation isn't completed, and Battelle wouldn't comment on the cause of the error.