image copyrightReutersThe US government is seeing a growing number of migrant arrivals at the border these days.The US government plans to fly back to Haiti thousands of migrants who have gathered under a bridge on the border with Mexico in recent days, US media report.The flights will begin on Sunday and there could be up to eight a day, officials told the Associated Press (AP) news agency.At least 10,000 people, mostly Haitian immigrants, are camping under the bridge that connects Del Río, Texas, with Ciudad Acuña, Mexico, and more are expected.Del Rio Mayor Bruno Lozano declared a state of emergency.He described the situation as "unprecedented" and "surreal," saying the border patrol had been overwhelmed, and the migrants were living in impossible conditions.image copyrightReutersThe migrants camp under the bridge to protect themselves from the high temperatures.The makeshift camp has few basic services and some migrants, enduring temperatures of up to 37°C, are returning to Mexico for supplies.Shelters have been built out of giant reeds and many migrants are using the river for bathing and washing clothes, the AP reported.According to reports, at least two babies were born in the camp.The border crossing at Del Rio was temporarily closed Friday "to respond to urgent security needs presented" by the influx of migrants, US Customs and Border Protection said.The migrants are mostly Haitian, but there are also some Cubans, Venezuelans and Nicaraguans, authorities reports say.Many of them are part of a larger wave of Haitian migrants heading north, much of whom arrived in Brazil and other parts of South America after the 2010 earthquake.The migrants sleep under the bridge in harsh conditions, after having crossed the icy waters of the Rio Grande, waiting for the authorities to process their asylum applications.image copyrightReutersMigrants seeking asylum in the US bathe in the Rio Grande (Rio Bravo), on the border with Mexico.More than 10,500 migrants were under the Del Rio International Bridge Thursday night, Del Rio Mayor Bruno Lozano told Reuters.Ramsés Colón, a 41-year-old Afro-Cuban asylum seeker who worked in Peru to save money for the trip, said the Del Río camp is "chaos.""You stand there among thousands with your ticket, waiting your turn," he told the Washington Post.He is referring to the numbered tickets that authorities give to migrants while they wait to be processed.The Border Patrol said in a statement that it was increasing staffing at Del Rio to facilitate a "safe, humane, and orderly process.""To prevent injuries from heat-related illnesses, the shaded area under the Del Rio International Bridge is serving as a temporary staging site while migrants wait to be taken into USBP (United States Border Patrol) custody." , he added.They were provided with drinking water, towels and portable toilets, the statement added.Since taking office in January, Joe Biden, who has promised to reform American immigration, has created a task force to reunite migrant children with their families, halted construction of Donald Trump's border wall and called for reviews of legal immigration programs canceled by his predecessor.But he is also experiencing a record influx of migrants at the US southern border, including hundreds of unaccompanied children, who are being held in US centers.image copyrightReutersMigrants must wait their turn for their asylum application to be processed.The arrival of migrants has grown significantly in recent weeks.Last month, US authorities arrested more than 195,000 migrants at the border with Mexico, according to government data released Wednesday.And in July the number of people apprehended at the border topped 200,000 for the first time in 21 years, authorities figures show.Now you can receive notifications from BBC World.Download the new version of our app and activate it so you don't miss out on our best content.© 2022 BBC.The BBC is not responsible for the content of external sites.Read about our stance on external links.