ACUNA, Mexico—Authorities in Mexico have started blocking buses of migrants from reaching communities on the U.S.-Mexico border and plan to start deporting Haitians back to their home country. The Mexican government plans to start deporting migrants, primarily Haitians, on Tuesday, Piedras Negras Mayor Claudio Bres told Mexican news outlet Zocalo on Monday. Bres and other officials are slated to meet Tuesday with counterparts from Eagle Pass, Texas, which sits just across the border from their city, as the U.S. scrambles to deal with an immigration crisis that shows no signs of slowing down. Over 10,000 illegal immigrants amassed in Del Rio, Texas, about 60 miles northwest of Piedras Negras and Eagle Pass, in recent days. Most hail from Haiti. Over 6,500 have been removed from the area by U.S. border authorities. Others have moved across the Rio Grande River to Acuna, Mexico to mull their options. Mexican authorities also decided on …