Prisoners of the Abogado Antonio Jacinto Filho high security Penitentiary Complex, participate in a prison riot in the city of Aracaju, regional capital of Sergipe northwest state, Brazil, on April 16, 2012. Over 450 prisoners rioted inside the penitentiary complex as a protest over aggressions inflicted by prison security guards. Protesters took three security guards as hostages, reported local media. [Xinhua]