gang violence

At least 57 prisoners were killed by fellow inmates during a prison riot in northern Brazil in what authorities have described as a "targeted act" by gang members directed at a rival group.

The riot at Altamira prison began early Monday and lasted throughout the morning, according to authorities. Two prison officials were reportedly taken hostage, but later released after negotiations.

Keith Dannemiller/Photo courtesty of the International Organization for Migration ©2014 IOM

Central America is now the largest source of undocumented migration across the U.S. southern border. The U.S. government has ramped up deportations of Central Americans to deter people from coming. In June, Vice President Mike Pence even traveled to Guatemala to warn Central Americans: "Come to the U.S. legally or don't come at all."

And yet they keep coming. A new study by researchers at Vanderbilt University says that’s because the U.S. is in denial about the real reason Central Americans continue leaving home. It's not poverty, they say, but violence.