Illegal Immigrants: US - fuelled by sheer desperation, some set out on foot on a dangerous journey which carries a high cost

As the US state of Arizona fights to reinstate controversial sections of its law targeting illegal immigration, every day Mexican migrants risk their lives to cross into the United States.

Fuelled by sheer desperation, some set out on foot on a dangerous journey which carries a high cost.

Rob Reynolds reports. (July 31, 2010)