The shooting in the U.S. state of Louisiana was the latest in a month of extraordinary violence and racial tension in the United States.
Investigators said the shooter, an African American marine veteran, ambushed and killed three officers and injured three others before being killed by law enforcement. The incident happened just weeks after police officers in Baton Rouge were caught on camera shooting a black man several times.
The violence has focused renewed attention on how African Americans are treated in the U.S. and the larger issue of race relations.
