3,000 migrants begin walk north from south Mexico

Around 3,000 migrants set out Sunday on what they call a mass protest procession through southern Mexico to demand the end of detention centers like the one that caught fire last month, killing 40 migrants.

The migrants set out early Sunday from the city of Tapachula, near the Guatemalan border. They say their aim is to reach Mexico City to demand changes in the way migrants are treated. The migrants are mainly from Central America, Cuba, Venezuela, Ecuador and Colombia.

Mexican authorities have used paperwork restrictions and highway checkpoints to bottle up tens of thousands of frustrated migrants in Tapachula, making it hard for them to travel to the U.S. border.