Illegal immigrants walk before boarding the train that will take them northbound on their way to the U.S. in Arriaga, southern Mexico, Saturday, Feb. 2, 2008. U.S. and Mexican authorities told The Associated Press they have seen a dramatic drop in the number of Central American immigrants detained, indicating that factors in Mexico, not just U.S. border security, are contributing to the slowdown in illegal immigration to the U.S. (AP Photo/Rodrigo Abd)

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