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Officer killed at Dallas protest Dallas protest: Three police officers dead in sniper shooting
(35 minutes later)
One officer killed and several injured by gunfire at Dallas protest over police killing of black men, say officials Three Dallas police officers have been shot dead by snipers during protests against the shooting of black men by police, the authorities say.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. An "intensive" search for suspects was under way, Dallas Police Chief David Brown said.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. Gunfire broke out as demonstrators marched through the city, sending them fleeing for cover.
The protests were sparked by the deaths of Philando Castile in Minnesota and Alton Sterling in Louisiana.
Another eight police officers were injured, Mr Brown said. Two are in surgery, one is in a critical condition.
The Dallas protests were among several held across the US over the police use of lethal force against African Americans.
Philando Castile was shot dead at a traffic stop in St Paul on Wednesday, while Alton Sterling killed by police a day earlier in Baton Rouge.
Both incidents were captured on video, reigniting what has become a national debate.
US President Barack Obama said "all fair-minded people should be concerned" about the frequent police killings of black Americans.
Pointing to statistics showing African-American citizens are far more likely to be shot by police by whites, Mr Obama called on law enforcement to root out internal bias.
"When incidents like this occur, there's a big chunk of our fellow citizenry that feels as if it's because of the colour of their skin, they are not being treated the same,'' he said. "And that hurts."