According to Jalopnik, an auto news website, the latest investigation was prompted by a complaint from one of the automaker’s employees at the plant.

Following a complaint, California’s Occupational Safety and Health Administration (Cal-OSHA) stated, it has opened a third investigation into Tesla Inc’s factory in Fremont, California.

This latest case was opened on June 21, said Cal-OSHA, without providing details on the investigations beyond confirming that they are active and ongoing.

On Thursday, Jalopnik, an auto news website, had reported the latest investigation was prompted by a complaint from one of the automaker’s employees at the plant.

According to Erika Monterroza, a spokeswoman for Cal-OSHA, the first investigation was opened on April 12 after there was a serious injury to a millwright employed by Automatic Systems Inc. The second investigation, launched on April 17, came after Reveal, a news website, stated Tesla’s omissions in legally mandated reports made its safety record appear better than it was.

Tesla did not immediately respond to a request for comment.