The gunman who killed seven people and left at least 25 others injured on Saturday was fired from his job that morning and "on a long spiral down."

Odessa Police Chief Michael Gerke said at Monday news conference Seth Aaron Ator, 36, and his employer at Journey Oilfield Services both called 911 Saturday to complain about the other over the firing. The shooter made a "rambling statement," but no threats were made.

“Can’t speak to his motives or why he called,” Gerke said, noting such calls to police are routine.

Ator left the business before officers arrived and then called the FBI's tipline. In that call he also made no threats of violence, Gerke said.

Read more: USA Today