Latest on Dallas shootings from the Associated Press
Dallas Police Chief David Brown says a shooting attack that left five police officers dead was "well planned."
Speaking at an interfaith prayer vigil in downtown Dallas on Friday, Brown called the shootings the previous night a "well-thought-out evil tragedy," saying his force "won't rest until we bring everyone involved to justice."
Christian, Jewish and Muslim faiths were represented at the vigil that was attended by hundreds.
Seven other police officers were wounded in the shooting during a protest over the killing of black men by white police officers in Louisiana and Minnesota. Two civilians were also hurt, but Dallas Mayor Mike Rawlings has said no one suffered life-threatening injuries.
Brown has blamed "snipers," but it is unclear how many shooters were involved in Thursday's attack.
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Hillary Clinton and Donald Trump have put off political events out of respect for five police officers fatally shot during a protest in Dallas.
Clinton, the presumptive Democratic nominee, has postponed a rally scheduled for Friday in Pennsylvania, but still plans to travel to Philadelphia for a scheduled appearance at the African Methodist Episcopal Convention.
Trump has canceled his plans to address Hispanics in Miami on Friday.
The presumptive Republican nominee denounced the police deaths as "a coordinated, premeditated assault on the men and women who keep us safe." Clinton says she is mourning the officers killed "while doing their sacred duty to protect peaceful protesters."
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Authorities have apparently finished an initial search of the home of a suspect in the deadly attack on Dallas police officers.
Agents in Bureau of Alcohol, Tobacco, Firearms and Explosives vests on Friday carried several bags of unknown materials from 25-year-old Micah Johnson's home in the Dallas suburb of Mesquite.
Authorities stopped blocking off the street just before noon. No one answered a knock on the door at the home.
A Texas law enforcement official identified Johnson to The Associated Press as a suspect who was killed by police with a robot-delivered bomb. He spoke on the condition of anonymity because he wasn't authorized to release the information.
The Army says Johnson served in the Army Reserve and did one tour of duty in Afghanistan.
The Army says Johnson was a private first class and his military occupational specialty was carpentry and masonry.
His service dates, as provided by the Army, are March 2009 to April 2015.
The Army says Johnson deployed to Afghanistan in November 2013 and returned in July 2014.