The film world is in shock after a French documentary maker who spent years filming a brutally violent Salvadoran street gang was found shot to death in a gang-riddled El Salvador neighborhood. El Salvador's top prosecutor said Thursday the involvement of gangs was under consideration in the killing of Christian Poveda, a former war photographer whose latest film takes an intimate look at the violent lives of gang members deported back to the Central American country after serving time in U.S. prisons.