The search for the man suspected of shooting two Minnesota lawmakers in a "politically motivated" attack continued for the second day Sunday as authorities urged residents to keep their doors locked and cars secured.

Police say Vance Boelter impersonated a police officer when he shot State Sen. John Hoffman and his wife. He's accused of then going to state Rep. Melissa Hortman's home, where he shot and killed both Hortman and her husband.