Terrorism & Active Shooter

Chicago Hospital Shooting

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Chicago Hospital Shooting

Law enforcement officials work near Mercy Hospital Nov. 19, 2018. Multiple people, including a Chicago police officer, were reported shot at the Near South Side hospital. (Zbigniew Bzdak/Chicago Tribune)

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Chicago Hospital Shooting

Mercy Hospital is shown Nov. 19, 2018. Multiple people, including a Chicago police officer, were reported shot at the Near South Side hospital. (Zbigniew Bzdak/Chicago Tribune)

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Chicago Hospital Shooting

Officials work at an entrance at Mercy Hospital Nov. 19, 2018. Multiple people, including a Chicago police officer, were reported shot at the Near South Side hospital. (Zbigniew Bzdak/Chicago Tribune)

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Chicago Hospital Shooting

Chicago Police officers walk outside Mercy Hospital on the city's South Side where authorities say a shooting at the hospital has wounded multiple people, including a suspect and a police officer, Monday, Nov. 19, 2018, in Chicago. (AP Photo/Amanda Seitz)

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Chicago Hospital Shooting

Law enforcement officers including Chicago SWAT work an entrance at Mercy Hospital Nov. 19, 2018. Multiple people, including a Chicago police officer, were reported shot at the Near South Side hospital. (Zbigniew Bzdak/Chicago Tribune)

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Chicago Hospital Shooting

An ambulance believed to be carrying an injured Chicago police officer departs Mercy Hospital Nov. 19, 2018. Multiple people were reported shot on the Near South Side. (Zbigniew Bzdak/Chicago Tribune)

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Chicago Hospital Shooting

Chicago Police work the scene where a gunman opened fire at Mercy Hospital, Monday, Nov. 19, 2018, in Chicago. A police spokesman said the gunman was dead, but it was not immediately clear if he took his own life or was killed by police at the hospital on the city's South Side. (AP Photo/David Banks)

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Chicago Hospital Shooting

Chicago Police work the scene after a gunman opened fire at Mercy Hospital, Monday, Nov. 19, 2018, in Chicago. A police spokesman said the gunman was dead, but it was not immediately clear if he took his own life or was killed by police at the hospital on the city's South Side. (AP Photo/David Banks)

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Chicago Hospital Shooting

Chicago Police work the scene after a gunman opened fire at Mercy Hospital, Monday, Nov. 19, 2018, in Chicago. A police spokesman said the gunman was dead, but it was not immediately clear if he took his own life or was killed by police at the hospital on the city's South Side. (AP Photo/David Banks)

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Chicago Hospital Shooting

Chicago Police work the scene after a gunman opened fire at Mercy Hospital, Monday, Nov. 19, 2018, in Chicago. A police spokesman said the gunman was dead, but it was not immediately clear if he took his own life or was killed by police at the hospital on the city's South Side. (AP Photo/David Banks)

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Chicago Hospital Shooting

Monday, Nov. 19, 2018, in Chicago. (AP Photo/David Banks)

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Chicago Hospital Shooting

Employees from the hospital ride a Chicago Transit Authority bus after being evacuated from Mercy Hospital where shots were fired Monday, Nov. 19, 2018, in Chicago. A police spokesman said the gunman was dead, but it was not immediately clear if he took his own life or was killed by police at the hospital on the city's South Side. (AP Photo/David Banks)

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Chicago Hospital Shooting

Chicago Mayor Rahm Emanuel, left, comforts Police Superintendent Eddie Johnson Monday, Nov. 19, 2018 during a news conference at the University of Chicago Medical Center after a Chicago police officer was shot and killed, and a gunman two others killed, at a South Side hospital earlier Monday afternoon. (Chris Walker/Chicago Tribune)

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Chicago Hospital Shooting

Chicago police and firefighters form an honor guard as a Chicago Police officer Samuel Jimenez body is brought to the coroner Monday, Nov. 19, 2018, in Chicago. (AP Photo/David Banks)

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Chicago Hospital Shooting

Chicago police and firefighters form an honor guard as a Chicago Police officer Samuel Jimenez body is brought to the coroner Monday, Nov. 19, 2018, in Chicago. (AP Photo/David Banks)

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Chicago Hospital Shooting

Police and firefighters salute as an ambulance arrives at the medical examiners office carrying the body of an officer who was killed during a shooting at Mercy Hospital which left four people, including the gunman, dead Monday Nov. 19, 2018 in Chicago. (Armando L. Sanchez/Chicago Tribune)

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Chicago Hospital Shooting

Police salute as an ambulance arrives at the medical examiners office carrying the body of an officer who was killed during a shooting at Mercy Hospital which left four people, including the gunman, dead Monday Nov. 19, 2018 in Chicago. (Armando L. Sanchez/Chicago Tribune)