Texas Agents Apprehend 3 Large Groups of Illegal Immigrants Border Patrol in Texas encountered three large groups of illegal aliens attempting to enter the United States over the weekend near a city at the U.S.-Mexico border, authorities said. Agents of the Rio Grande City Border Patrol Station (RGC) apprehended a total of 736 immigrants in La Grulla—a city in Starr County about 13 miles from Rio Grande—between July 16 and July 18, U.S. Customs and Border Protection (CBP) said in a press release on Monday. The multi-day encounters started on the morning of July 16 after RGC agents working in the city observed a large group of 235 illegal immigrants making landfall in the United States.