Prosecutors say the man accused of killing a Minnesota lawmaker and wounding another went to the homes of two other lawmakers to carry out more carnage on the night of the shootings.

A Minneapolis police officer was killed when he responded to a shooting call and was providing medical attention to a man who shot him in what authorities are calling an ambush.

Two police officers and a first responder were shot and killed early Sunday and a third officer was injured at a suburban Minneapolis home in an exchange of gunfire while responding to a call involving an armed man who had barricaded himself inside with family.