The U.S. has acknowledged to a United Nations panel it must do more to tackle police brutality and racism in the wake of a string of police killings of unarmed African Americans. Speaking to the United Nations Human Rights Council today in Geneva, James Cadogan, an official in the Justice Department’s Civil Rights Division, said the deaths of Freddie Gray, Eric Garner, Walter Scott and several others have “challenged us to do better and to work harder for progress.” He added, “We must rededicate ourselves to ensuring that our civil rights laws live up to their promise.”