ACUNA, Mexico—Some of the thousands of illegal immigrants who have amassed near the Texas border are leaving the United States, going back to Mexico to pick up supplies or avoid being deported back to their home countries. Haitians and others were witnessed Monday crossing the Rio Grande River to enter Acuna, Mexico, as they consider their options following a U.S. crackdown on the illegal immigrant camp under the international bridge just north of the border in Del Rio. Phanel, a Haitian who has been living in Chile for three years, was one of the immigrants who went to Acuna. He told The Epoch Times he was stocking up on supplies, including water and fruit, after hearing around camp that everybody who stayed would get deported. Phanel, who declined to give his last name, said he was considering what to do next. Yaneth, 32, whose husband is Haitian, also expressed concern …