Investigators are trying to determine why a man targeted a Pennsylvania hospital, taking workers inside the intensive care unit hostage and holding one staff member at gunpoint as her hands were bound by zip ties.

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

The officer killed while responding to a shooting and hostage situation at a Pennsylvania hospital on Saturday had celebrated his 30th birthday just days earlier, authorities revealed Sunday. Officer Andrew Duarte of the West York Borough Police Department was among those who responded when the armed suspect,