The suspect accused of assassinating a Minnesota lawmaker and shooting another this weekend drove to the homes of at least four state politicians as part of a carefully planned attack, federal authorities said on Monday.

The search for Vance Luther Boelter, the FBI-wanted man who is suspected of shooting two Minnesota lawmakers and their spouses at their residences in the early hours of Saturday morning, is well into its second day.

Officials said a man charged with shooting two lawmakers and their spouses was apparently thwarted at two other politicians’ homes.

Vance Boelter, the man suspected of killing a Minnesota lawmaker and her husband and wounding another lawmaker and his wife, texted his roommate that he “may be dead shortly” on Saturday morning after the attack.

The man suspected of fatally shooting a Minnesota lawmaker and her husband and wounding another and his wife had “stalked his victims like prey” before opening fire at their homes, elaborately disguised as a law enforcement officer,

U.S. Capitol Police increased security for Klobuchar and Smith following the attacks, which occurred early Saturday morning. Minnesota's entire congressional delegation, both Republicans and Democrats, released a joint statement condemning the killings.

Officials say Vance Luther Boelter 'stalked his victims like prey.' He faces multiple state and federal charges.