Argentine forensic experts have voiced serious doubts about a Mexican government probe into the abduction and suspected massacre last year of 43 trainee teachers, who officials have declared dead.
Brazilian President Dilma Rousseff's popularity has plunged by nearly half since her recent re-election as a severe government corruption scandal, an economic slowdown and surging prices for electricity, gasoline and bus fares left voters feeling misled.
African nations pulling together a regional force to fight Nigeria's Boko Haram militants on Saturday pledged 8,700 soldiers, policemen and civilians, an increase from earlier estimates for the mission.