US President Barack Obama has said all Americans should be concerned about the frequent police killings of black men.
His comments, as he arrived in Poland for a Nato summit, came after two more black men died in such incidents.
Philando Castile was shot dead during a traffic stop in Minnesota on Wednesday, while Alton Sterling was shot dead by police in Louisiana a day before.
Mr Obama said the US must say "we're better than this", and that its importance went beyond race.
"This is not just a black issue. It's not just a Hispanic issue. This is an American issue that we should all care about," he said.
"All fair-minded people should be concerned."
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."
The latest incidents follow a long line of controversial deaths of African-Americans at the hands of the police that has ignited a national debate about the use of lethal force.