Migrant caravan departs Mexico City and heads north

A Central American migrant bypasses a subway turnstile after leaving the temporary shelter at the Jesus Martinez stadium, in Mexico City, Friday. (AP Photo/Rodrigo Abd)

MEXICO CITY — Thousands of Central American migrants were back on the move toward the U.S. border Saturday, after dedicated Mexico City metro trains whisked them to the outskirts of the capital and drivers began offering rides north.