Scattered cries of "Black Lives Matter" interrupted a moment of silence for slain police officers at the Democratic National Convention Thursday night.
Dallas County Sheriff Lupe Valdez called for the moment of reverence "in honor of all of American fallen officers," but after a few seconds, a few people shouted the famous phrase out.
Some of those in attendance shushed them.
Five Dallas police officers were killed in an ambush by a gunman on July 7 who expressed solidarity with the Black Lives Matter movement. The murders happened during a peaceful protest over the controversial police shootings of two black men in Louisiana and Minnesota.