A gunman who held medical staff hostage before killing a police officer and wounding five others at a hospital in south-central Pennsylvania Saturday is believed to have visited the facility in the days leading up to the incident,

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

A police officer was killed Saturday after responding to a shooting at UPMC Memorial Hospital just outside of Harrisburg, Pennsylvania, where the suspected gunman also was killed, according to state police.