Officer killed, two injured in 'ambush' shooting; Attacker had arsenal of weapons and ammunition

A gunman opened fire on police officers responding to an accident in Fargo, North Dakota.
The attacker killed Officer Jake Wallin and critically injured two other officers.
Officer Zach Robinson fatally shot the gunman after ordering him to surrender.
The shooter had multiple firearms, explosives, and over 1,800 rounds of ammunition.
A news conference will discuss the police use of deadly force in the incident.