Immigration officials detain Central American migrants during a raid by federal police on a northbound freight train, in San Ramon, Mexico, just after midnight on Friday, Aug. 29, 2014. Migrants captured in raids are deported to their home countries. The largest crackdown by Mexican authorities on illegal migration in decades has decreased the flow of Central American migrants trying to reach the United States, and has dramatically cut the number of child migrants and families, according to officials and eyewitness accounts along the perilous route.(AP Photo/Rebecca Blackwell)
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