Unaccompanied migrant children from Texas are being shipped to San Diego ...

Hundreds of unaccompanied migrant children are being shipped to California to be cared for in an emergency shelter set up at the San Diego Convention Center after crossing the border into Texas. 

Sources told DailyMail.com that 12 buses containing 725 children arrived on just one night shortly after the temporary facility opened in April.

The facility has space for 1,450 children and is already nearing capacity with 1,317 installed at the center on May 1. 

It comes as Texas has been overwhelmed by an influx of migrants crossing the Rio Grande River - many of them families and unaccompanied children.

On Monday the White House released new data claiming that the number of migrant minors in US Customs and Border Protection custody has dropped by 88 per cent from the end of March.

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According to the figures touted by DHS Secretary Alejandro Mayorkas, only 677 children remain in CBP facilities, down from the 5,767 on March 28. 

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Hundreds of unaccompanied migrant children are being flown in to San Diego shelters after crossing the border in Texas. Pictured: A group of girls waiting in line outside the San Diego Convention Center

Hundreds of unaccompanied migrant children are being flown in to San Diego shelters after crossing the border in Texas. Pictured: A group of girls waiting in line outside the San Diego Convention Center 

Exclusive DailyMail.com photos lay bare the bleak reality of the temporary shelter, with girls pictured being walked through a loading dock at the back of the center to use the showers

Exclusive DailyMail.com photos lay bare the bleak reality of the temporary shelter, with girls pictured being walked through a loading dock at the back of the center to use the showers

The San Diego Convention Center has been transformed into an 'emergency intake site' for migrant children as US border officials struggle to cope with the influx of asylum seekers at the border

The San Diego Convention Center has been transformed into an 'emergency intake site' for migrant children as US border officials struggle to cope with the influx of asylum seekers at the border 

CBP has been able to almost double the rate it processes children and more quickly transfer them to shelters and emergency housing facilities set up by Heath and Human Services.

But despite the expediting processing, the number of illegal crossings have not slowed.

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The most recent figures show that illegal crossings shot up by 70 per cent between February and March, with Border Patrol saying they encountered 101,028 people in February and 172,331 the following month.

Texas is the busiest state and has asked the Federal Government to step in with help - with HHS Secretary Xavier Becerra asking other states to take a share of the children.

But with California also dealing with record numbers, authorities have had to create emergency shelters such as the conference center facility.

Carol Fiertz, of the US Department of Health and Human Services which is running the shelter, said: 'Our facility was originally intended to care for females between 13 and 17.

'Then the decision was made to include younger siblings. We are now organized to care for both boys and girls ages five to 12 and females aged 13 to 17.

'Most children are from Guatemala, Honduras, and El Salvador with smaller numbers from other countries.

'Our goal is to place all of the children in our care with their US sponsors before we relinquish the site back to the Convention Center on July 15th.' 

Most of the deportees are flown in from Brownsville, Texas, where the majority of migrants cross into the US

Most of the deportees are flown in from Brownsville, Texas, where the majority of migrants cross into the US

DailyMail.com witnessed the ICE chartered flights arriving, with migrants unloaded from the plane and loaded onto three buses on every occasion

DailyMail.com witnessed the ICE chartered flights arriving, with migrants unloaded from the plane and loaded onto three buses on every occasion

The children (pictured after being loaded onto buses) are then transported to the shelters, which are being run by local charities and the US Department of Health and Human Services

The children (pictured after being loaded onto buses) are then transported to the shelters, which are being run by local charities and the US Department of Health and Human Services

Sources told DailyMail.com that 12 buses containing 725 children arrived on just one night shortly after the temporary facility opened in April. It was initially intended to house only females ages 13 to 17, but officials are now also taking in boys and girls ages five to 12

Sources told DailyMail.com that 12 buses containing 725 children arrived on just one night shortly after the temporary facility opened in April. It was initially intended to house only females ages 13 to 17, but officials are now also taking in boys and girls ages five to 12

One of the buses is sent north to the shelters, while the other two head south to the border accompanied by a Border Patrol car

One of the buses is sent north to the shelters, while the other two head south to the border accompanied by a Border Patrol car

Access to the facility is tightly controlled, with authorities drawing curtains around the huge venue to protect the children's privacy while cops patrol the area, including with sniffer dogs.

But charity workers are allowed in, with Nadine Toppozada, director of refugee and immigrant services at Catholic Charities San Diego, among them.

The NGO is scheduled to begin providing legal services to the children in May and Toppozada visited shortly after the first busloads of girls arrived.

She described a spartan setting with the children sleeping on camp beds in pods of 20, each with their own monitor.

Toppozada said: 'It's an emergency intake site [EIS] so the girls have beds plus health screening and access to medical care.

'Each bus that arrives stays together as a group and they sleep in their own curtained off sections and eat meals together with

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