The targeted shootings of two Minnesota state lawmakers this weekend underscore a grim trend: An increasingly volatile political climate has left state and local officials more exposed than ever to threats and harassment.

A man impersonating a police officer shot and killed Minnesota state legislator Melissa Hortman and her husband at their home in what Gov. Tim Walz called “targeted political violence.”

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.