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Asylum seekers camping at El Chaparral in Tijuana, Mexico, on the border with the U.S. on Aug. 3, 2021. Photo: Guillermo Arias/AFP via Getty Images

The number of migrants detained along the U.S.-Mexico border exceeded 200,000 for the first time in 21 years in July, according to U.S. Customs and Border Protection (CBP) enforcement data released Thursday.

Why it matters: Biden officials had predicted that the summer heat would lead to a decline in the volume of migrants crossing the border. The CBP data tell a different story, reigniting concern about the administration's ability to accommodate migrants as Delta continues its spread.

By the numbers: 212,672 migrants were taken into U.S. custody in July. Of those, 82,966 were family members, 18,962 were unaccompanied teenagers and children, and the rest were single adults.

  • Unaccompanied minors crossing the border increased 24% from June to July.
    • The average number of unaccompanied children in CBP custody was 1,363 per day in July, compared to a daily average of 794 in June.
  • Family migrant encounters have also spiked again, nearing the peak of 2019.
  • In 2021, CBP has detained 845,307 unique individuals at the border, compared to 796,400 during the same time period in 2019.
  • The "vast majority" of single adults and families are expelled under the Trump-era Title 42 policy, which President Biden has elected to retain despite criticism.
    • Just 12% of July encounters with migrant family members resulted in expulsion to Mexico.
  • For the first time, Biden officials have launched "expulsion flights" under the policy to fly Central American families into southern Mexico.
    • The hope is for these families to return home rather than attempt to re-enter the U.S., but human rights advocates have called the pattern troubling, noting that hundreds of migrants, including small children, are oftentimes dropped off in remote areas with little shelter, the Washington Post reports.

Worth noting: The number of migrants coming to the border from nations other than Mexico, Guatemala, Honduras and El Salvador continues to climb.

What they're saying: "CBP continues to take necessary measures to safely manage the Southwest Border and protect the health of communities, personnel, and migrants themselves," CBP Acting Commissioner Troy Miller said in a statement.

  • "CBP has also adapted to changing dynamics between ports of entry along the Southwest Border, continuing to take steps to mitigate the spread of COVID-19 by expelling roughly half of those encountered under CDC’s Title 42 public health authority."

The big picture: Biden has faced criticism for his management of the border crisis, which has led to COVID-19 outbreaks and backlogged processing.

  • Federal officials have had to squeeze over 15,000 unaccompanied minors into military barracks in close quarters.
    • More than 1,000 parents and children have been exposed to the coronavirus or tested positive.
  • The government released about 50,000 migrants who crossed the southern border illegally into the United States without a court date in July, a sign of just how overwhelmed some sectors of the border continue to be.
  • The ACLU is returning to court with the Biden administration over the U.S. government's continued use of Title 42.
  • Two prominent advocacy organizations have stopped working with the administration on humanitarian exceptions over concerns over the policy, per AP.

Go deeper

Photos show Border Patrol whipping at migrants from horseback

Photo: Paul Ratje/AFP via Getty Images

New photos show Border Patrol agents whipping at and charging their horses at migrants in Del Rio who were attempting to make their way to an encampment under the international bridge, where thousands of Haitian migrants have sought refuge trying to seek asylum.

Our thought bubble, via Axios' Russell Contreras: The images of Border Patrol agents on horseback charging at Haitian migrants drew an emotional response online since the Border Patrol has a troubled and violent history against communities of color.

U.S. begins deportation flights to Haiti from Del Rio

Migrants, many of them Haitian, cross the Rio Grande to get food and supplies near the Del Rio-Acuna Port of Entry in Ciudad Acuna on Sept. 18. Photo: Paul Ratje/AFP via Getty Images

The U.S. commenced deportation flights to Haiti on Sunday for the thousands of Haitian migrants seeking shelter in the small Texas border town of Del Rio, a source told the Associated Press.

Driving the news: More than 10,000 migrants, primarily from Haiti, have been staying in a crowded temporary camp with poor conditions under the international bridge in Del Rio. Hoping to find refuge in the United States, they've had to bear with filthy conditions and the scorching sun for days, per an NBC News affiliate.

By the numbers: Haitian emigration

Expand chart
Data: CBP; Chart: Sara Wise/Axios

The number of Haitians crossing the U.S.-Mexico border had been rising even before their country's president was assassinated in July and the island was struck by an earthquake a month later.

Why it matters: A spike during the past few weeks — leaving thousands waiting in a makeshift camp under a bridge in Del Rio, Texas — has prompted a crackdown and deportations by the Biden administration.