The number of parents and children booked into the country’s only immigrant family detention center, in Dilley, Texas, plummeted in February by more than 75% compared with a month earlier, according to Immigration and Customs Enforcement data obtained by ProPublica.

Between April 2025, when President Donald Trump started sending families there, and January of this year, the number of people sent into detention with their families averaged around 600 per month. In February, those so-called books-ins fell to 133. As of mid-March, they dropped again to just 54.

This week there were only around 100 people in family detention at Dilley, compared with an average daily population in January of over 900, the data shows.

Current and former ICE officials and lawyers with clients in Dilley said they were unable to explain the reason for the sharp decline. However, they said the shift followed weeks of mounting public pressure generated in part by the widespread publication of letters written by several of the detained children in which they described the conditions inside Dilley and their despair at being ripped from their homes and schools.

ProPublica published several of those letters on Feb. 9 after visiting the facility — about an hour south of San Antonio — in mid-January. The letters set off a storm of outrage in Washington and across the country. They were raised in congressional hearings and pasted on posters in anti-ICE demonstrations.

Rep. James Walkinshaw, a Democrat from Virginia, read the letters aloud to ICE’s acting director, Todd Lyons, during a congressional hearing on Feb. 10, pressing him for answers about whether the children’s detention could cause adverse psychological effects. He pointed to one drawing by a 5-year-old Venezuelan girl named Luisanney Toloza of her family.

“My son’s 5. He can’t write many words, but he can communicate through drawings like this,” Walkinshaw said, making special note of the expressions on the family’s faces. “None of the faces are smiling.”

It was another 5-year-old who first triggered public attention to children being detained at Dilley. Liam Conejo Ramos was picked up on Jan. 20 in Minnesota and sent to the facility with his father. A photograph of him at the time of his detention, wearing a blue bunny hat, went viral.

Detainees, emboldened by the attention, organized a protest in a yard at the facility that was captured in an aerial photograph and widely published on social media. Lawmakers demanded multiple visits to push for the release of Ramos and others. Nearly 4,000 doctors, nurses and health professionals sent a letter to the Trump administration calling for the immediate release of all children currently in immigration detention. This month, social media personality Rachel Accurso, an educator better known as Ms. Rachel, who makes popular children’s programming, posted a video conversation with one of the kids detained at Dilley to her 4.9 million Instagram followers, garnering more than 3,700 comments.

Rep. Joaquin Castro, a Democrat from Texas, has been at the forefront of a push by legislators from his party to shut down Dilley and for the administration to find alternatives to family detentions. When told about the drop in the number of families being held at Dilley, he said, “That trailer prison is no place for children, and I’m glad to hear that the numbers continue to decline,” adding, “It’s a reminder that people can make a difference by speaking up.”

The Department of Homeland Security, which oversees ICE, said in a statement that custody decisions are made “daily, on a case-by-case basis,” adding that the “administration does not make immigration decisions based on public opinion. We follow the rule of law.” In the past, the agency has said that Dilley offers families a safe environment equipped with access to educational materials, child care necessities and round-the-clock medical and mental health care. Meanwhile, CoreCivic, the private prison company operating the facility, said in a statement it does not have “any say whatsoever” in whether detainees are deported or released.” In previous statements, it has said that the health and safety of detainees is its “top priority.”

Dilley first opened as a family detention facility under former President Barack Obama in 2014, mostly for recent border crossers. Trump kept the facility running during his first term, but President Joe Biden stopped holding families in 2021, arguing the United States shouldn’t be in the business of detaining children.

Soon after taking office a second time, Trump resumed family detentions at Dilley. As border crossings have dropped to record lows, more of the families being held there have been arrested inside the United States and have been in the country long enough to lay down roots and build networks of relatives and friends. The children detained there have ranged in age from newborns to older teenagers. The vast majority of adults held at Dilley had no U.S. criminal record.

Following the protests and the publication of children’s letters, detainees and attorneys interviewed by ProPublica said guards took away crayons, colored pencils and drawing paper during recent room searches. This week, ProPublica learned the facility had cut off access to video calls in common areas.

The Trump administration said in a recent court filing that personal property had not been destroyed at Dilley and items confiscated during searches were “limited to materials identified as protest-related and not authorized under facility rules.” CoreCivic “vehemently” denied staff confiscated or destroyed children’s personal artwork or supplies. DHS said the restrictions were put in place on video calls following the livestreaming of recorded calls online “that resulted in the unauthorized dissemination of law enforcement sensitive information.” The agency added the video calls are still available in private rooms, as is access to in-person visitation and phones.

While a long-standing legal settlement, known as the Flores agreement, holds that children should generally not be detained for more than 20 days, the data ProPublica obtained showed the average days in custody was longer than that for every month since family detentions resumed at the facility last year. In each month between November and February, the average stay in family detention was over 50 days.

DHS has said in the past that the Flores agreement, in place since the 1990s, is outdated and should be terminated because newer regulations address the needs of children in detention.

One Egyptian family, Hayam El Gamal and her five children ranging in age from 18 to 5-year-old twins, has been at Dilley for nine months. They were taken into custody after the father, Mohamed Soliman, was charged over an alleged antisemitic attack in Boulder, Colorado, that killed one person and injured 13 others. The family said it had no knowledge of his plans. DHS said it is still investigating.

One 13-year-old Guatemalan boy named Edison was released from Dilley with his mom this week. During his 92-day detention, Edison had cried in video calls to his father back in Chicago, saying he felt like he was being treated like a criminal. (His father asked that his son’s last name not be used.) Then in the early hours of Wednesday morning, a guard came to their bunk room and told him and his mom to start packing their belongings. By that night, they were on a plane to Chicago to be reunited with Edison’s dad. “We don’t understand why they were released,” his dad said. “All I can tell you is it was a miracle from God.”

As soon as they landed, the family went home to enjoy a seafood dinner, one of Edison’s favorites.