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,

A memorial is growing outside the police department in West York, a borough outside of York, Pennsylvania, after officer Andrew Duarte was killed in the line of duty on Saturday.

The shooter has been identified as Diogenes Archangel Ortiz. He allegedly entered the hospital with a handgun and zip ties.