A man is detained by law enforcement while protesting the shooting death of Alton Sterling outside the headquarters of the police department in Baton Rouge, Louisiana, U.S. July 9, 2016. Alton Sterling, a 37-year-black man and father of five, was shot at close range while being held down by two white police officers. The shooting, captured on cell phone videos, aggravated the unrest that has coursed through the United States for two years over the use of excessive force by police, especially against black men.