YORK, Pa. (AP) — 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. A police officer was killed and two other officers were wounded in a shootout that left the gunman dead Saturday. Officer Andrew Duarte (pictured) of the West York Borough Police Department died in a shootout with suspect Diogenes Archangel-Ortiz, 49, who police said was holding a female hospital worker at gunpoint when police opened fire. Officer Duarte was a 2016 graduate of PennWest California, university officials confirmed Sunday. He earned a Bachelor of Science degree in criminal justice.A doctor, nurse and custodian who suffered gunshot wounds in the chaos were reported in stable condition. Authorities released no new information Sunday about a possible motive for the attack. They had said that the man knew an individual who was recently in the hospital and that he specifically targeted the ICU.