Investigators found a cowboy hat near the vehicle and were working to determine whether it belongs to Boelter.

Residents of Sibley County are encouraged to lock their doors and secure their vehicles, adding that law enforcement will be going to area residences to ask to search properties.

The Minnesota Bureau of Criminal Apprehension reports that Boelter was last seen on Saturday morning in Minneapolis, after the shootings, wearing a light-colored cowboy hat, a dark long-sleeve shirt, and light pants while carrying a dark cross-body bag.