![DALLAS, TX - July 8, 2016: Dallas Mayor Mike Rawlings (R) looks on during a press conference at Dallas City Hall as Dallas Police Chief David Brown speaks on the fatal shootings of five police officers on July 8, 2016 in Dallas, Texas. At least one sniper killed five officers and wounded seven others in a coordinated ambush at a anti-police brutality demonstration in Dallas. The sniper was killed, and three other people are in custody, officials said. (Photo by Stewart F. House/Getty Images)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/Metro/Images/dallas7.r.jpg)
Stewart F. House/Getty Images
Dallas officials called for an end to ?divisiveness? after the shooting.
![Investigators walk the scene of a shooting in downtown Dallas, Friday, July 8, 2016. Snipers opened fire on police officers in the heart of Dallas during protests over two recent fatal police shootings of black men. (AP Photo/LM Otero)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/Metro/Images/dallas6.r.jpg)
LM Otero/AP
Authorities investigated the shooting scene in downtown Dallas.
![DALLAS SLIDER 1 A Dallas Area Rapid Transit police officer receives comfort at the Baylor University Hospital emergency room entrance Thursday, July 7, 2016, in Dallas. Police say one rapid-transit officer has been killed and three injured when gunfire erupted during a protest in downtown Dallas over recent fatal shootings by police in Louisiana and Minnesota. (Ting Shen/The Dallas Morning News via AP)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas1.r.jpg)
Ting Shen/the dallas morning news via ap
An officer cried at a hospital emergency room.
![DALLAS SLIDER 1 Dallas Police respond after shots were fired at a Black Lives Matter rally in downtown Dallas on Thursday, July 7, 2016. Dallas protestors rallied in the aftermath of the killing of Alton Sterling by police officers in Baton Rouge, La. and Philando Castile, who was killed by police less than 48 hours later in Minnesota. (Smiley N. Pool/The Dallas Morning News)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas3.r.jpg)
Smiley N. Pool/the dallas morning news via ap
Police responded after shots were fired.
![DALLAS SLIDER 1 Emergency responders administer CPR to an unknown patient on a stretcher as law enforcement officials stand nearby at the emergency receiving area of Baylor University Medical Center, early Friday, July 8, 2016, in Dallas. (AP Photo/Tony Gutierrez)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas4.r.jpg)
Tony Gutierrez/associated press
Emergency responders administered CPR to an unknown patient.
![DALLAS SLIDER 1 Dallas police respond after shots were fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said. (Maria R. Olivas/The Dallas Morning News via AP)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas10.r.jpg)
Maria R. Olivas/the dallas morning news via ap
Officers crouched behind a cruiser as they responded to the attack.
![DALLAS SLIDER 1 epa05414820 Dallas police officers and hospital staff form a line around the emergency entrance to Baylor Scott&White Hospital as a police officer's body is taken from the facility in Dallas, Texas, USA, 08 July 2016. Police report that five officers have died as a result of their injuries as it appeared that snipers shot on police from elevated positions during a protest rally in Dallas on 07 July. EPA/RALPH LAUER](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas8.r.jpg)
RALPH LAUER/european pressphoto agency
Police officers and hospital staff formed a line at a hospital emergency entrance.
![DALLAS SLIDER 1 Dallas police respond after shots were fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said. (Maria R. Olivas/The Dallas Morning News via AP)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas7.r.jpg)
Maria R. Olivas/the dallas morning news via ap
Officers were seen with running at the scene.
![DALLAS SLIDER 1 Dallas police respond after shots were fired during a protest over recent fatal shootings by police in Louisiana and Minnesota, Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests; several officers were killed, police said. (Maria R. Olivas/The Dallas Morning News via AP)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas9.r.jpg)
Maria R. Olivas/the dallas morning news via ap
Police searched for suspects and possible explosives in the immediate aftermath.
![DALLAS SLIDER 1 Bicycles used by Dallas police lie on the street Thursday, July 7, 2016, in Dallas. Snipers opened fire on police officers during protests over recent fatal shootings by police in Louisiana and Minnesota; several officers were killed, Dallas police said. (Maria R. Olivas/The Dallas Morning News via AP)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas2.r.jpg)
Maria R. Olivas/the dallas morning news via ap
Bicycles used by Dallas police were left on the street.
![DALLAS SLIDER 1 A Dallas police officer covers his face as he stands with others outside the emergency room at Baylor University Medical Center, Friday, July 8, 2016, in Dallas. Snipers opened fire on police officers in the heart of Dallas on Thursday night, killing some of the officers. (AP Photo/Tony Gutierrez)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas5.r.jpg)
Tony Gutierrez/associated press
An officer covered his face as he stood with others outside an emergency room.
![DALLAS SLIDER 1 Brent Thompson, of Dallas Area Rapid Transit, one of five officers killed in a shooting incident in Dallas, Texas, U.S., is pictured in this undated handout photo obtained by Reuters July 8, 2016. Brent Thompson via LinkedIn/Handout via Reuters](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas6.r.jpg)
dallas area rapid transit
DART Police Officer Brent Thompson was one of five officers killed.
![DALLAS SLIDER 1 A crime scene investigator looks a shot out windows after a shooting in downtown Dallas, Friday, July 8, 2016. Snipers opened fire on police officers in the heart of Dallas during protests over two recent fatal police shootings of black men. (AP Photo/LM Otero)](www_bostonglobe_com/rf/image_r/Boston/2011-2020/2016/07/08/BostonGlobe.com/ReceivedContent/Images/dallas11.r.jpg)
LM Otero/associated press
A crime scene investigator looked at shot-out windows.
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