Deadly force, as defined by the United States Armed Forces, is the force in which a person uses, causing or that a person knows, or should know, would create a substantial risk of causing, death or serious bodily harm. The use of Deadly Force is justified only under conditions of extreme necessity as a last resort, when all lesser means have failed or cannot reasonably be employed. Firearms, bladed weapons, explosives, and vehicles are among those weapons the use of which is considered deadly force. The use of non-weapons in an agressive manner, such as a baseball bat or tire iron, may also be considered deadly force. "Use of deadly force" is often granted to police forces when the person or persons in question are believed to be an immediate danger to people around them. For example, an armed man in a shopping mall shooting at random without regard to the safety of the people around him, and refusing or being unwilling to negotiate, would likely warrant usage of deadly force, asa means to prevent further danger to the community.