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BATON ROUGE, LA -JULY 11: Students gather at a prayer vigil for Alton Sterling at the Memorial Tower on the Louisiana State University campus July 11, 2016 in Baton Rouge, Louisiana. Sterling was shot by a police officer in front of the Triple S Food Mart in Baton Rouge on July 5th, leading the Department of Justice to open a civil rights investigation. (Photo by Mark Wallheiser/Getty Images)

BATON ROUGE, LA -JULY 11:  Students gather at a prayer vigil for Alton Sterling at the Memorial Tower on the Louisiana State University campus July 11, 2016 in Baton Rouge, Louisiana. Sterling was shot by a police officer in front of the Triple S Food Mart in Baton Rouge on July 5th, leading the Department of Justice to open a civil rights investigation. (Photo by Mark Wallheiser/Getty Images)