The man who authorities say entered a Pennsylvania hospital with zip ties and a pistol over the weekend had recent contact with the hospital's intensive care unit, where he took staff members hostage and was killed in a shootout that left a police officer dead and others injured.

Authorities described the shooting of a gunman who opened fire at a Pennsylvania hospital as “absolutely justified, beyond any and all doubt.”

Military officials say a shooting at a U.S. Air Force base in New Mexico has left one airman dead and another wounded

One airman is dead and another is injured with a gunshot wound following a "shooting incident" involving security forces at Kirtland Air Force Base in New Mexico early Saturday.

Three people, including a teen girl, were hospitalized after a drive-by shooting on the city’s Southwest Side early Saturday morning.

Chicago police were searching for multiple suspects after three people, including a teenager, were injured in a drive-by shooting on the city’s Southwest Side, police said. The shooting was reported at around 4:13 a.