Fewer than expected migrants arrived at the border after Title 42 expired, but officials remain on high alert

Despite warnings of a potential crush of migrants that sent thousands of federal personnel to the southern border and US cities scrambling to prepare, the days after the expiration of Title 42 saw a much narrower influx of migrants than expected.

Officials warned the expiration of the Covid-related border restriction policy, which allowed authorities to swiftly turn away migrants at the US-Mexico border, could aggravate the humanitarian crisis at the southern border. In the days leading up to its expiration, long lines formed at checkpoints and makeshift encampments proliferated in border communities.

But US authorities saw a 50% drop in the number of migrant encounters along the border over the previous two days compared to earlier in the week - before the policy, known as Title 42, ended - Homeland Security Secretary Alejandro Mayorkas told CNN's Dana Bash on Sunday. US and Mexican officials say the Biden administration's warnings to asylum-seekers and displays of immigration enforcement have deterred more migrants from crossing the border illegally.

The situation at the border is "very fluid," a senior Homeland Security official told reporters Monday.

There were about 6,300 border encounters on Friday, and 4,200 on Saturday, Mayorkas said, adding the number stood at around 10,000 before the Title 42 policy ended.

Officials warn that it's too early to say whether the surge in migrants at the border has peaked.

Many who leave their homes and head to the US make long and dangerous treks in hopes of finding better, safer lives. Some may be fleeing violence, experts say, while others may be immigrating for economic opportunities or to reunite with family.

At a shelter in El Paso, Texas, families spent Mother's Day in limbo. Migrant mothers told CNN it was their maternal instinct that drove them to make the perilous journeys to the US.

"A parent will do anything to see their children safe," said Conny Barahona, a migrant from Honduras who was at the shelter with her 9-year-old. She waited there for her two other daughters - an 18-year-old and a 20-year-old - before traveling to their next destination.

"We left Honduras together and that's how we must remain," she said.

Even as US cities are seeing lower numbers of migrants than expected, they are preparing spaces and resources for a potential surge.

In El Paso - which has seen hundreds of migrants sleeping on sidewalks after a recent spike in arrivals - Mayor Oscar Leeser said the city has so far seen a "smooth transition" out of Title 42 but is still preparing for what the future may hold.

Brownsville Independent School District in Texas announced Monday that it expects to utilize school campuses currently not in use to process and provide services to migrants.

Mayors of other US cities, worried an influx of migrants will strain resources, are looking to the federal government for assistance. Mayors Eric Adams of New York City, Karen Bass of Los Angeles, Sylvester Turner of Houston and Michael Hancock of Denver signed a letter to President Biden requesting a meeting to discuss the situation.

New York City's Roosevelt Hotel in Midtown Manhattan, which has been closed for nearly three years, will reopen as an arrival and resource center for incoming migrants. The hotel will open 175 rooms for children and families this week, with plans to scale up capacity to around 850 rooms, a statement from the mayor's office said.

The city says it currently has about 35,000 migrants in its care.

"Without federal or state assistance, we will be unable to continue treating new arrivals and those already here with the dignity and care that they deserve," Mayor Eric Adams said in a statement Saturday.

In Washington, DC, a busload of migrants arrived at the Naval Observatory on Sunday evening. The bus originated from Texas, according to a source familiar with the situation who is unauthorized to speak on the record.

Texas Gov. Greg Abbott has bused thousands of migrants to Democratic-led cities since last year as an affront to President Biden's border policies. He recently ramped up his efforts, with at least two buses arriving at the Naval Observatory last week.

The Biden administration has warned of grave consequences for migrants circumventing the lawful pathways for asylum. Community leaders and officials in Mexico say that kind of tough talk, along with the administration's display of immigration enforcement, is deterring more migrants from crossing the border illegally.

In the northern Mexican city of Tijuana, Enrique Lucero, the city's director of migrant affairs, attributes the drop in illegal crossings to the Biden administration's messaging and to the Mexican government's deployment of the national guard to the border. "We've seen images of (deportation) planes that have arrived in Guatemala, El Salvador and Honduras," Lucero said. "The five-year bar (on reentry to the US) has opened migrants' eyes."

The five-year ban on reentry Lucero referenced is one of the possible legal consequences migrants face under Title 8 immigration processing if they are deported from the US. Title 8 is the decades-old protocol that US immigration officials reverted to after Title 42 ended last week.

In the northern Mexican city of Reynosa, Pastor Hector Silva runs two prominent migrant shelters, and says that word is also spreading online - through various chat groups - about the consequences of crossing illegally into the US. "Don't cross because if you cross, you'll get deported," Silva says some of the online messages say.

"They (migrants) thought that with the end of Title 42 the border would be open; but they've realized that's not the case," Lucero said.

Lucero said in Tijuana illegal crossings have been facilitated by smugglers who charge migrants about $500 dollars; but the presence of the Mexican National Guard on Mexico's northern border - which started last Wednesday - has curbed the presence of those illicit groups.

Lucero said there are about 6,000 migrants in the city's network of 31 shelters - and his recommendation to them is to use CPB One, a software application launched by the Biden administration in January and expanded after the lifting of Title 42 last week. It allows certain migrants to set up appointments to enter legally through a port of entry.

"The recommendation is CBP One, the only path that is regular, orderly and safe for asylum in the United States," said Lucero.

But both in Reynosa and in Tijuana, migrants get impatient, Silva and Lucero said, because appointments are difficult to come by.

Lucero noted that the 6,000 migrants waiting in Tijuana are competing for about 240 CBP appointments. One appointment is made available in the area every day.

CNN's Tina Burnside, Lauren Mascarenhas and DJ Judd contributed to this report.