One of the suspects was in a shootout with police with the help of a bomb robot.
The shooting began near one of the busiest parts of the city's downtown, filled with hotels and restaurants. Dallas Police Chief David Brown told reporters that two snipers fired "ambush style" from an elevated position late last night.
Brown said officers cornered one of the suspects and tried to negotiate with him for several hours before talks broke down. After an exchange of gunfire, officers attached explosives to a bomb robot and detonated them near the suspect.
Brown said the suspect told negotiators that he was upset about recent shootings involving police officers.
"The suspect said he wanted to kill white people, especially white officers," Brown said.
The suspect also told police that he was working alone.
"We're hurting. Our profession is hurting. Dallas officers are hurting. We are heartbroken. There are no words to describe the atrocity that occurred to our city. All i know is that this must stop - this divisiveness between our police and our citizens," Brown said.
Police said earlier three other suspects were in custody in connection with the shooting, though Brown said they were still investigating.
"I'm not going to be satisfied until we turn over every stone," he said. "If there's someone out there associated with this, we will find you."
According to the police chief, the suspects have threatened to have placed a bomb in the downtown area and that his department was coordinating with federal agencies.
Six police officers and a civilian injured in the attack.
Obama, who is in Warsaw for the NATO Summit, denounced the "despicable" attacks in Dallas.
"There has been a vicious, calculated and despicable attack on law enforcement," Obama said, adding that the officers were "targeted" by multiple suspects.
Earlier upon his arrival in the Polish capital said that
the fatal shootings of black men by police this week in Louisiana and Minnesota were "symptomatic of a broader set of racial disparities" and all Americans should be troubled by these incidents of brutality.
Citing statistics that showed black people were far more likely to be arrested and shot by police, Obama said African- Americans are 30 per cent more likely than whites to be pulled over.
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.
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