Witness: A World in Conflict Through a Lens, Witness: Rio

Combat photographer Eros Hoagland ventures into Juarez, Mexico, where drug violence has left over 10,000 dead.

Photographer Michael Christopher Brown snaps shots in the ever-complicated and dangerous region that is Libya in the post-Gaddafi era.

French photojournalist Veronique de Viguerie travels to South Sudan to cover the Arrow Boys, an unpaid force of farmers who have taken up arms against Joseph Kony's Lord's Resistance Army.

In Rio de Janeiro, a city crippled by war between drug gangs and police, fearless photographer Eros Hoagland goes in search of bodies.