[Breaking news update 5:08 a.m. ET]
A suspect involved in a standoff with Dallas police at a downtown parking garage has died, a law enforcement official told CNN.
K-9 units are sweeping the area for possible bombs. The official did not say how the suspect died.
[Previous story posted at 4:40 a.m. ET]
Shooters killed five officers during protests against police in downtown Dallas, marking the deadliest single attack on U.S. law enforcement since September 11, 2001.
Gunfire rang out Thursday night as demonstrators marched against the shooting deaths of two African-American men by police in Louisiana and Minnesota.
A total of 11 officers were shot, and some of the six officers injured are undergoing surgery, authorities said.
It was the deadliest single attack on law enforcement since the 2001 terror attacks, when 72 officers died, according to the National Law Enforcement Officers Memorial Fund.
Here’s what we know:
— A total of 10 police officers were shot by snipers during the protests, Dallas Police Chief David Brown said. An 11th officer was shot during an exchange of gunfire with a suspect, authorities said.
— Brown said it’s unclear how many suspects were involved, but three people are in custody.
— Dallas police have been negotiating and exchanging gunfire with a suspect for hours at a parking garage in downtown.
— “The suspect has told our negotiators that the end is coming,” Brown said. The suspect also told negotiators more officers are going to get hurt, and that bombs are planted all over downtown Dallas.
— Two of the shooters were snipers, who fired “ambush-style” from an “elevated position,” Brown said.
— Officers killed include one DART officer. DART, the Dallas Area Rapid Transit agency, operates buses and commuter rail in the city and surrounding suburbs.
— DART identified the officer killed as Brent Thompson, 43. He joined the transit agency in 2009, and was its first officer killed in the line of duty, DART tweeted.
— The Dallas Police Department circulated a photo of a man they said was a suspect in the shooting, but later called him a person of interest and said he turned himself in.
— Witness Ismael Dejesus said he filmed the shooter from his hotel balcony about 50 yards away. He described the gunman as wearing tactical pants and a tactical shirt. He had a weapon with a “pretty big magazine,” he said.
— “He got out of there, walked over to the pillar, put a magazine in and started firing,” he said. “It did look planned. He knew where to stand, he had ammo ready.”
— Retired FBI special agent Steve Moore said an attack of that magnitude required advance work.
— “This was an attack planned long before– waiting for an opportunity to go,” Moore said. “I think there was so much logistically, ammunition-wise. They may not have planned the location, they may not have planned the vantage point. But they had prepared for an attack before last night’s shooting is my guess.”
— President Barack Obama has been notified about the shooting, and a team is keeping him updated, the White House said.
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SOURCE: CNN, Faith Karimi and Ralph Ellis