一名了解调查情况的高级执法官员告诉美国广播公司新闻，对最近失去亲人的痛苦和愤怒显然刺激了周六早上在宾夕法尼亚州医院重症监护室袭击的男子。
据州政府官员称，在约克县一家医院发生的人质劫持事件中，一名警察被杀，至少五人被枪杀。
官员们在周六下午的新闻发布会上说，嫌疑人第欧根尼·阿尔汉格尔·奥尔蒂斯(Diogenes Archangel-Ortiz)在上午10点30分左右带着一把半自动手枪和拉链进入西曼彻斯特镇的UPMC纪念医院，然后进入重症监护室，并劫持了几名医院工作人员。
官员们说，奥尔蒂斯开枪打死了一名医院医生、护士和管理员，他们现在都很稳定。三名警察在事件中中弹，一人死亡。
西约克区警官安德鲁·杜阿尔特在枪击中丧生，该区证实。另外两名警察被送往医院，情况稳定。
这位高级官员说，大天使奥尔蒂斯对他所认为的缺乏对一名刚刚进入医院重症监护室的家庭成员的照顾感到不安。这位官员补充说，这位家庭成员是晚期的——这是大天使奥尔蒂斯难以接受的。
这个家庭成员在上周去世了。
这位高级官员说，当大天使奥尔蒂斯周六进入医院时，他前往ICU，那里有一个小型医疗小组，包括一名治疗过他家庭成员的医生。
大天使奥尔蒂斯被认为是单独行动的事件。
“这是我们社区的巨大损失，”约克县地方检察官蒂姆·巴克说。"杜阿尔特警官为保护他人献出了生命。"
来自多个机构的执法部门，包括西约克区警方、宾夕法尼亚州警方和约克县快速反应小组，对这一情况做出了回应。警察试图与Ortiz谈判，但他从ICU出来，用枪指着一名医院工作人员，她的双手被拉链绑住。
巴克说:“警察们没有任何办法。"他们开枪打死了奥尔蒂斯，避免了更多的生命损失。"
“在审查监控录像和证人陈述后，绝对清楚，毫无疑问，警察使用致命武力是合法的，”他说。“坦率地说，他们需要这样做——因为这样做，他们有可能拯救更多的生命。”
UPMC说，没有病人在枪击中受伤。
Motive revealed in Pennsylvania hospital shooting that left 1 officer dead, 5 injured
Anguish and anger at the very recent loss of a loved one apparently spurred on the man who would target the intensive care unit at a Pennsylvania hospital Saturday morning, a senior law enforcement official briefed on the investigation told ABC News.
One officer was killed and at least five others were shot in the hostage situation that unfolded at a hospital in York County, according to state officials.
The suspect, Diogenes Archangel-Ortiz, entered UPMC Memorial in West Manchester Township with a semi-automatic handgun and zip ties at around 10:30 a.m. He then went to the ICU and took several hospital staff hostage, officials said at a press conference Saturday afternoon.
Ortiz shot a hospital doctor, nurse and custodian, all of whom are now stable, officials said. Three police officers were shot during the incident and one died.
West York Borough police officer Andrew Duarte was killed in the shooting, the borough confirmed. The other two officers were hospitalized in stable condition.
Archangel-Ortiz was upset over what he perceived was a lack of care for a family member who had just been in the hospital's ICU, the senior official said. That family member was terminal -- something Archangel-Ortiz had difficulty accepting, the official added.
The family member had died within the last week.
When Archangel-Ortiz entered the hospital Saturday, he headed for the ICU where there was a small medical team, including one doctor who had treated his family member, the senior official said.
Archangel-Ortiz is believed to have acted alone in the incident.
"This is a huge loss to our community," York County District Attorney Tim Barker said. "Officer Duarte gave his life protecting others."
Law enforcement from multiple agencies, including West York Borough Police, Pennsylvania State Police, and the York County Quick Response Team, responded to the situation. Officers attempted to negotiate with Ortiz, but he emerged from the ICU holding a hospital staff member at gunpoint, her hands bound by zip ties.
"The officers were left with no recourse," Barker said. "They opened fire, killing Ortiz and preventing further loss of life."
"After reviewing surveillance footage and witness statements, it is absolutely clear and beyond any doubt that the officers acted lawfully in using deadly force," he said. "Quite frankly, they needed to—because by doing so, they potentially saved even more lives."
UPMC said no patients were injured in the shooting.
