NOGALES, Ariz. -- Mattresses, portable toilets and showers were brought in Saturday for 700 unaccompanied minors who spent the night sleeping on plastic cots inside an Arizona warehouse, a federal official said.
The Homeland Security official said that about 2,000 mattresses have been ordered for the makeshift holding center -- a warehouse that has not been used to shelter people in years.
Arizona Gov. Jan Brewer's spokesman, Andrew Wilder, said Friday that conditions at the center are so dire that federal officials have asked the state to immediately ship medical supplies to the center in Nogales.
The U.S. Department of Homeland Security started flying immigrants to Arizona from the Rio Grande Valley in Texas last month after the number of immigrants -- including more than 48,000 children traveling on their own -- overwhelmed the Border Patrol there.
Immigrant families were flown from Texas, released in Arizona, and told to report to an Immigration and Customs Enforcement (ICE) office near where they were traveling within 15 days. ICE has said the immigrants were mostly families from Central America fleeing extreme poverty and violence.
The Homeland Security official, who spoke on condition of anonymity because there was no authorization to discuss the matter publicly, said the holding center opened for unaccompanied children because the U.S. Department of Health and Human Services had nowhere to turn.
"They became so overwhelmed and haven't kept up with planning," the official said.
At the holding center, vendors are being contracted to provide nutritional meals, according to U.S. Customs and Border Protection officials. The Federal Emergency Management Agency, meanwhile, will provide counseling services and recreational activities.
The Homeland Security official said the number of children at the warehouse was expected to double to around 1,400. The warehouse has a capacity of about 1,500.
The warehouse began sheltering children flown from South Texas last Saturday. About 400 were scheduled to arrive Friday but, because of mechanical issues with the planes, only about 60 came, the Homeland Security official said. Saturday's flights were canceled, also because of mechanical problems. There are flights scheduled through mid-June.
Federal authorities plan to use the Nogales facility as a way station, where the children will be vaccinated and checked medically. They will then be sent to facilities being set up in Ventura, California; San Antonio, Texas; and Fort Sill, Oklahoma.
The Homeland Security official said that the children would be moved out of the Nogales site as soon as Health and Human Services finds places for them.
But the official said: "As quickly as we move them out, we get more. We believe this is just a start."
The children being held in Nogales are 17 or younger. The official estimated three of every four were at least 16.
Nogales Mayor Arturo Garino visited the facility Saturday, but he did not get inside the site where the children were being held. Mr. Garino said he did meet with Border Patrol officials. He was told some of the children are as young as 1 year old.
The town has begun collecting clothing donations for the kids, he said.I
Ms. Brewer sent an angry letter to President Barack Obama on Monday demanding that the program of dropping off families at bus stations in Phoenix stop immediately. She called the program dangerous and unconscionable, asked for details and demanded to know why state authorities weren't consulted or even informed.
The governor said she hadn't received a response to her letter by Friday.
"I have reached out to Federal Homeland Security Director Jeh Johnson for answers. Meanwhile, I reiterate my call on President Obama to secure our southern border and terminate this operation immediately," Ms. Brewer, a Republican, said in a statement.
Immigration officials can immediately return Mexican immigrants to the border, but they are much more hard-pressed to deal with Central American migrants who illegally cross into the U.S. In recent months, waves of migrants from nations south of Mexico have arrived in Texas.
The Homeland Security official said that legally, only their parents or guardians can take custody if the government makes the children eligible for release.
Officials in Central America and Mexico have noticed a recent increase in women and children crossing the border.
The perception that some immigrants could be getting a free pass into the U.S. could lead to more attempts to cross the border.