Federal prosecutors have filed sweeping new charges against 57-year-old Vance Luther Boelter, accusing him of launching a coordinated, premeditated attack against elected Minnesota officials.

The charges, which include two counts of interstate stalking resulting in death, two counts of murder through use of a firearm, and two additional firearms-related offenses, were filed in U.S. District Court for Minnesota.

The new complaint describes Boelter’s June 14 actions as part of a carefully planned “campaign of stalking and violence,” targeting state and federal officials—most of them Democrats. He used online people-search engines to compile a handwritten list of names and home addresses, and drove to at least four homes that night while disguised as a police officer. Officials say Boelter’s notebooks and the GPS unit in his SUV contained addresses for dozens of lawmakers and abortion rights advocates, including Rep. Melissa Hortman, Sen. John Hoffman, and at least two additional officials.