About 50,000 migrants who crossed the southern border illegally have now been released in the United States without a court date. Although they are told to report to an Immigration and Customs Enforcement office instead, just 13% have showed up so far, Axios has learned.

Why it matters: The sizable numbers are a sign of just how overwhelmed some sectors of the U.S.-Mexico border continue to be: A single stretch covering the Rio Grande Valley had 20,000 apprehensions in a week. The figures also show the shortcomings of recent emergency decisions to release migrants.

• It's unprecedented for agents to release migrants without an official notice to appear in court. Where it has occurred recently, migrants have instead been given a list of addresses and contacts for ICE offices across the country and told to report to one of them.
• The hope has been for migrants to show up at these offices after reaching their final destination, to get work permits.

By the numbers: Just 6,700 migrants who crossed between mid-March and mid-July showed up at ICE offices as of Monday, one source briefed on Department of Homeland Security data told Axios.

• 16,000 have not showed up and passed the 60-day reporting window they were given. That's 25 no-shows for every one that has checked in.
• Another roughly 27,000 migrants who crossed and were released during the same time frame have yet to turn up, but remain within the 60-day window for reporting. One DHS official emphasized that nearly 70% of migrants are within the 60-day window or have reported to ICE.

Meanwhile migrants continue to be released. Rep. Henry Cuellar (D-Texas) told Axios that as of Monday, 7,300 migrants in the Rio Grande Valley sector had been released during the past week without court dates.

• Cuellar said the total number of migrants released since March was up to 55,000.

The big picture: The new data come as immigration agents in the Rio Grande Valley highlight over 20,000 apprehensions made in just one week, as noted on Sunday in a tweet by the chief Border Patrol agent for that sector.

• It's a sign of the continued surge in people attempting to illegally cross the U.S.-Mexico border.
• That's after months of higher-than-normal border crossings, record months for encounters with migrants and more than 1 million apprehensions for the year.
• The White House's emphasis on root causes in Central America, focus on critiques of former President Trump's harsh border policies and insistence that the inflated numbers are just seasonal are falling flat.

What they're saying: "We will always be a nation of borders, and we will enforce our immigration laws in a way that is fair and just. We will continue to work to fortify an orderly immigration system," the White House said in a fact sheet released Tuesday morning.

• “While individuals have 60 days to check in with ICE, many are proactively reaching out to ICE to begin their official immigration processing, including by receiving a Notice to Appear," DHS spokesperson Meira Bernstein told Axios. "Those who do not report, like anyone who is in our country without legal status, are subject to removal by ICE.”