In Dallas, five police officers have been shot dead, and six others wounded, in one of the deadliest attacks on police in U.S. history. The police were patrolling a demonstration in downtown Dallas against the recent police shootings of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota. Videos of the two African-American men being killed by police have sparked protests across the nation. Authorities in Dallas described Thursday’s assault as a planned ambush. The gunfire erupted at around 8:45 p.m. local time, just as the peaceful protest was wrapping up. Four of the slain officers worked for the Dallas Police Department; the fifth was part of the Dallas Area Rapid Transit force. At least one protester was injured in the shooting. One of the suspected snipers reportedly died from a self-inflicted gunshot. Three other people have been taken into custody. Earlier this morning, President Obama spoke in Warsaw, where he is attending the NATO summit.

President Barack Obama: “These law enforcement officers were targeted, and nearly a dozen officers were shot. Five were killed. Other officers and at least one civilian were wounded. Some are in serious condition, and we are praying for their recovery.”

At the time of this broadcast, no information has been released about the suspected shooters. As of May, more than 70 percent of police killed this year were killed by white men.