A massive manhunt entered a second day on Sunday in Minnesota for the gunman who killed a Democratic state lawmaker while posing as a police officer, a crime that Governor Tim Walz characterized as a "politically motivated assassination.

Authorities identified the suspect as 57-year-old Vance Boelter, and the FBI issued a reward of up to $50,000 for information leading to his arrest and conviction.

Minnesota State Rep. Melissa Hortman and her husband were fatally shot Saturday, while State Sen. John Hoffman and his wife were wounded.