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,

YORK, Pa. - . The BriefA possible motive for the deadly hospital shooting in York, Pennsylvania, is still unknown.Officials say the suspect had recent contact with the ICU "for a medical purpose."The hospital remained closed to visitors on Sunday.

A gunman and a responding officer were killed after shots were fired Saturday at a hospital in central Pennsylvania.