Many immigrants are driven on their 2,000 mile exodus through Mexico under the impression that the US does not deport minors.
In poorer areas such as Iztapalapa, the rudimentary drainage systems are simply no match for the rainy season and extreme flooding.
Police can use batons, teargas and lethal firearms as a last resort to combat violent demonstrators if they first identify themselves.
Federal police are turning autodefensas in Michoacán from small-town militiamen into a crack anti-cartel fighting unit: the Fuerza Rural.
About 27,000 people have disappeared throughout Mexico between 2007 and 2013, according to officials.