Mexico is defending a government-published guide for migrants who want to enter the United States illegally.
U.S. immigration-control groups and at least one congressman have criticized the booklet, saying Mexico is promoting illegal immigration.
The 32-page booklet is entitled "Guide for the Mexican Migrant." Using comic-book style pictures, it offers safety tips such as how to avoid dehydration while walking through desert areas on the U.S.-Mexican border.
The Mexican government is distributing more than one million copies of the guide.
Congressman J.D. Hayworth has condemned the booklet, calling it an attack on U.S. sovereignty.
But Mexican diplomats say the guide is designed to reduce the number of migrant deaths, which rose to more than 300 in 2003. Dangers along the U.S.-Mexican border include fast-moving rivers, rugged terrain and the intense desert heat.
Some information for this story provided by Reuters.