the texas border face a tough choice, cross back into mexico or face being put on a plane to haiti where some have not lived for years. and there is growing concern about how the migrants are treated both in mexico and the u.s. cbs' manuel bojorquez reports from the border. >> reporter: the department of homeland security is now investigating this incident where border patrol agents on horseback are seen intimidating haitian migrants at the southern border. >> i was horrified to see the images, and we look forward to learning the facts. we do not tolerate any mistreatment or abuse of a migrant. period. >> reporter: the flashpoint, this makeshift camp in del rio, texas between a mass deportation effort and haitians fleeing back to mexico, fewer than so 10 thousand migrants remain at the camp. to escape deportation, some were forced to cross the chest-high river holding their children above their heads. even though this stretch of the