In a late-night address from Warsaw, Poland, President Obama discussed Thursday's tragedy in Dallas in which two snipers killed five police officers and wounded several other officers and civilians.
He called the shooting a "vicious, calculated and despicable attack on law enforcement," and noted that although details on the shooters remain scarce, their motivations are undoubtedly "twisted."
"Let's be clear: There is no possible justification for these kinds of attacks or any violence against law enforcement," the president said, sounding weary after a week in which two black men were killed by police officers in Louisiana and Minnesota.
Thursday's shooting in Dallas happened in the immediate aftermath of a peaceful Black Lives Matter protest that had been organized in reaction to the killing of Alton Sterling in Baton Rouge and Philando Castile near Minneapolis.
"Today, our focus is on the victims and their families. They are heartbroken. The entire city of Dallas is grieving," Obama said. "Police across America — it is a tight-knit family — feels this loss to their core, and we are grieving with them."