Eight people were killed and at least seven others were injured in a shooting at a FedEx warehouse in Indianapolis late Thursday, and the gunman was believed to have killed himself, the police said.

Officer Genae Cook of the Indianapolis Metropolitan Police Department told reporters Friday morning that at least five other people had been hospitalized with injuries, including one in critical condition. Two others were treated at the scene and released. She said employees at the facility were still being interviewed by detectives and might not have had the chance to contact their families.

Officer Cook said that the police were working to identify the gunman and that no law enforcement officers had been injured.