In a statement, Dallas Police Chief David Brown said that three Dallas police officers were killed by snipers, however no suspect has been arrested.
Three Dallas police officers were killed by snipers on Thursday as protests were being held in the downtown area over the fatal police shootings of black men in Minnesota and Louisiana this week, the police chief said.
Dallas Police Chief David Brown said in a statement two snipers shot 10 officers, three of whom were killed. Two officers were in surgery, one in critical condition. No suspects in custody.
"An intensive search for suspects is currently underway," Brown said.
Officials also said four Dallas transit officers were shot but their condition was unknown.
President Barack Obama said the killings were tragedies. "All of us as Americans should be troubled by these shootings, because these are not isolated incidents. They're symptomatic of a broader set of racial disparities that exist in our criminal justice system," he said in remarks after arriving in Poland.
PROTESTERS GATHER
The use of force by police against African-Americans in cities from Ferguson, Missouri, to Baltimore and New York has sparked periodic and sometimes violent protests in the past two years, and has spawned a movement called Black Lives Matter. Anger has intensified when the officers involved in such incidents have been acquitted or not charged at all.
Reynolds' video showed a police officer outside the car pointing a gun. Reynolds described what was going on, sometimes speaking calmly to the police officer, sometimes with her voice rising as she feared Castile was dying. Reynolds said Castile was shot after police pulled their car over, citing a broken tail light. "Nothing within his body language said 'Kill me, I want to be dead,'" she said on Thursday.
Dozens of protesters gathered at the governor's mansion in St. Paul, about 15 km southeast of the scene of the incident, where the governor spoke at a news conference with Reynolds and civil rights activists. When Reynolds spoke earlier in the day, people shouted "murder", and called for the arrest of the police officer involved.
"All of these killings of young black men, I am ready to take my grandson somewhere else," said one protester, Chanell Peaches Wall, 59, who said she recently moved to the area from Tennessee. She held a placard that said "He was my son too" on one side and "No justice, no peace" on the other.
Demonstrations over the deaths of Castile, Sterling and other black men killed by police were planned in St. Paul, Chicago and several smaller cities on Thursday evening, according to organisers posting on social media.
In New York City, several hundred protesters blocked traffic in Times Square, chanting "Hands up, don't shoot," and other slogans. Other rallies, including one in Atlanta, were planned for Friday. Weekend protests as far away as London were being discussed on Twitter.
People shout slogans against police as they take part in a protest against the killings of Alton Sterling and Philando Castile during a march in New York July 7, 2016. Credit: Reuters
People hold a sign on July 7, 2016 in Los Angeles, California, protesting the fatal police shooting of two black men, Alton Sterling and Philando Castile. Credit: AFP
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 "People rally across the United States to protest the deaths of Alton Sterling and Philando Castile")
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