McALLEN (AP) — President Donald Trump’s order to stop separating migrant children from their parents spread confusion and uncertainty along the border, with no clear plan to reunite families but with growing signs the administration is dialing back its “zero tolerance” policy on those entering the U.S. illegally.

Immigrants who remained locked up and separated from their families struggled to get in touch with children being held in many cases hundreds of miles away. Some parents said they didn’t even know where their children were.

A senior Trump administration official said that about 500 of the more than 2,300 children taken from their families at the border in recent weeks have been reunited since May.

Federal agencies are working to set up a centralized reunification process for the remaining children at a detention center on the Texas side of the border, said the official, who was not authorized to discuss the matter publicly and spoke to The Associated Press on condition of anonymity.

There were also signs that the administration is easing, for now at least, its policy of prosecuting all adults caught crossing the border illegally.

Karla (2nd L) and Angelica (3rd L) (who didn’t want their last names used) stand in line at the Paso Del Norte Port of Entry so they can ask for asylum on June 20, 2018 in El Paso, Texas. (credit: Joe Raedle/Getty Images)

The federal public defender’s office for the region that covers cases from El Paso to San Antonio said Thursday the U.S. Attorney’s Office would be dismissing cases in which parents were charged with illegally entering or re-entering the country and were subsequently separated from their children.

“Going forward, they will no longer bring criminal charges against a parent or parents entering the United States if they have their child with them,” wrote Maureen Scott Franco, the federal public defender for the Western District of Texas, in an email shown to the AP.

In the Texas border city of McAllen, federal prosecutors unexpectedly did not pursue charges against 17 immigrants. A federal prosecutor said “there was no prosecution sought” in light of Trump’s executive order ending the practice of separating families.

But the president showed no sign of softening in public remarks, even as Congress failed again to pass immigration reform.

Immigrants like Ever Castillo and Diva Funes were among those affected by the mixed signals from the U.S.

The couple from Comayagua, Honduras, arrived at the border Thursday and presented themselves for asylum with their five children, ages 1 to 12 years. Castillo said they did not know about the family separation policy when they began hitchhiking to the U.S. two weeks ago.

He said Border Patrol agents told them they would be separated if they entered the U.S., and they opted to walk back across the international bridge into Reynosa, Mexico. Rather than be separated from his children, “I said, ‘better that we head back to my country,'” said Castillo.

A 7-year-old boy and his migrant mother separated a month ago were reunited Friday after she sued in federal court and the Justice Department agreed to release the child.

The two were reunited at about 2:30 a.m. at Baltimore-Washington International Airport in Maryland, hours after a Justice Department lawyer told a U.S. District Court judge the child would be released.

The mother, Beata Mariana de Jesus Mejia-Mejia, had filed for political asylum after crossing the border with her son, Darwin, following a trek from Guatemala. She said she started crying when the two were reunited and that she’s never going to be away from him again.

Other immigrants who remained locked up and separated from their families struggled to stay in touch with children who are in many cases hundreds of miles apart.

A 31-year-old Brazilian man held in Cibola County Correctional Center in Milan, New Mexico, said he didn’t know when he would see his 9-year-old son again.

The father told the AP in a phone interview Thursday that he spoke to his son once by phone since they were separated 26 days before. The man, who is seeking asylum, spoke on condition of anonymity because he said in Brazil he is sought by a criminal gang for failure to pay an $8,000 debt, and fears retribution.

The man said he worried about his son, who only speaks Portuguese. “He cried. He was so sad,” the father said. “I had promised him it would only be three to five days.”

Thursday’s uncertainty resulted from the abrupt ending of a White House policy that separated more than 2,300 children from their parents over the past several weeks — part of the administration’s zero-tolerance immigration policy that was a signature campaign promise of Trump.

After Trump’s executive order, a host of unanswered questions remained, including what will happen to the children already separated from their parents and where the government will house all the newly detained migrants in an already overcrowded system.

The administration began drawing up plans to house as many as 20,000 migrants on U.S. military bases, though officials gave differing accounts as to whether those beds would be for children or for entire families. The Justice Department also went to court in an attempt to overturn a decades-old settlement that limits to 20 days the amount of time migrant children can be locked up with their families.

“We have to be very, very strong on the border. If we don’t do it, you will be inundated with people and you really won’t have a country,” Trump said.

The Trump administration previously had not said whether any of the more 2,300 children separated from their families had been reunited. The senior Trump administration official who spoke to the AP on condition of anonymity said many of the 500 children already reunited were back with their families within days of being separated. But other parents have said they didn’t know where their children were.

Meanwhile, the mayors of about 20 U.S. cities gathered at a holding facility for immigrant children in the border city of El Paso. They accused Trump of failing to address a crisis of his own making and called for the immediate reunification of immigrant children with their families.

In Washington, the House killed a hard-right immigration bill Thursday and Republican leaders delayed a planned vote on a compromise GOP package, with party members fiercely divided on the issue. Democrats oppose both measures.

The rejected bill would have curbed legal immigration and bolstered border security but would not have granted a pathway to citizenship to “Dreamers” who arrived in the country illegally as children.

The delayed vote was on a compromise bill between GOP moderates and conservatives that would offer Dreamers a pathway to citizenship and provide $25 billion for Trump’s border wall, among other things.

(© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)