BATON ROUGE, LA -JULY 06:  Protesters block traffic and dance on cars near theTriple S Food Mart where Alton Sterling was shot and killed, July 6, 2016 in Baton Rouge, Louisiana. Sterling was shot by a police officer in front of the Triple S Food Mart in Baton Rouge on Tuesday, July 5, leading the Department of Justice to open a civil rights investigation. (Photo by Mark Wallheiser/Getty Images)