Police exchange gunfire with a shooter in Dallas. WARNING: Graphic content
Investigators say twelve police officers in Dallas have been shot, and five were killed near a Thursday night protest over the fatal police shootings in Baton Rouge and Falcon Heights.
Two civilians were also wounded in the incident.
Dallas Police say two officers have undergone surgery, and three are in critical condition.
Police believe four suspects were involved. One woman has been arrested, along with two others who sped away from the scene in a black Mercedes after an officer saw them put a camouflaged bag in the back.
On Friday morning, Dallas Police Chief David Brown says the fourth suspect died in an overnight standoff with police.
Officials had to go in with a “remote device” and kill the suspect, as negotiations broke down.
Brown previously said the man told negotiators “the end is coming,” and that he planned to kill more officers.
He says the suspect told them that he acted alone, and that he was not affiliated with any groups.
Brown says the man was “very angry,” and had a lot of anger towards the Black Lives Matter movement.
He says he was looking to harm more people, in particular, white people, “especially white officers.”
He also claimed that he had rigged the second storey parking garage where he holed up, along with other areas of downtown Dallas with bombs.
A sweep of the area, however, did not turn up any explosives.
With heavy hearts, we are devastated to report a fourth officer has been killed.— Dallas Police Depart (@DallasPD) July 8, 2016
The rally started as a peaceful protest, and was being held in response to the shooting deaths of Philando Castile and Alton Sterling by white officers earlier this week.
The shooting broke out around 9 pm, after a demonstration by about 800 people wrapped up and transformed into a march through the streets. About 100 police officers were present at the time.
Brown says snipers from elevated positions started shooting at officers “Ambush Style,” by triangulating on officers from two perches in rooftop garages.
Brown says some of the officers were shot in the back.
He says a motive for the shootings is still unclear, and that the suspects in custody are uncooperative.
He says police believe the shooters may have known the route the march would take and planned accordingly, but he says its unclear if any of them were a part of the rally or getting information from someone in the crowd.
Police also issued a statement earlier in the evening saying a man who had first been identified as a suspect, then later as a “person of interest” had turned himself in.
He has since been released and is no longer considered a suspect.
WATCH: Dallas Police provide 10:30 pm update on shooting:
A heartbreaking morning
Dallas Mayor Mike Rawlings says the city’s core is still an active crime scene, and has asked workers to stay away in the morning.
“It is a heartbreaking morning, to lose these four officers that proudly served our citizens,” he said. “Our city and country must come together and lock arms and heal the wounds we all feel from time to time.”
Dallas governor Greg Abbot has told the Texas Department of Public Safety to offer the city any assistance it needs.
WATCH: Chilling video of the moment gunfire breaks out (WARNING: Disturbing content)