Some US Border Patrol agents believe the threat from ISIS on the US border is very real. But some southwestern politicians call the contention little more than anti-Islamic fear-mongering, saying the evidence doesn't support claims of ISIS infiltration.
The US-Mexico border is an unforgiving place, where weather can shift quickly from blazing heat to freezing nights. And even those trying to cross into the US illegally will call 911 when they are scared, suffering and need help.
Arizona Sheriff Joe Arpaio has earned friends and foes nationwide for his tough stance on illegal immigration. Now, immigrants and their allies in several US states are mobilizing to get him out of office.
Twenty years after the massacre at Srebrenica, the US aims to deport Bosnian immigrants suspected of involvement. But one Bosnian Serb facing deportation says he's been unfairly labeled a war criminal.
There was another exodus from Central America. It happened in the 1980s, when almost one million Guatemalans and Salvadorans fled to the US to escape civil war. And a group of American activists and religious leaders took big risks to help them stay.