MCALLEN, Texas — An agent-led media tour of the border this week was interrupted twice by radio calls of migrants wandering in the area. The incidents happened in the busiest area for illegal immigration along the 2,000-mile southwest border, the Border Patrol’s Rio Grande Valley Sector, which has seen the highest number of migrant apprehensions crossing into South Texas from Mexico over the past five years than any of the other eight southwest sectors.

Journalists from a handful of news outlets, including the Washington Examiner, were about five miles south of Mission, Texas, driving just east of the Anzalduas International Bridge in Granjeno to a dirt road known as Rancon Road when the agent in the SUV leading the reporters’ caravan got a call that six people, including a baby, had just been located down by the river.