Immigration officials dropped off about 50 more undocumented migrants, mostly from Central America, Friday morning at a Greyhound bus station near Phoenix Sky Harbor International Airport, where they were left to fend for themselves as overwhelmed volunteers sought help for them.

The group was the latest in a series of migrant drop-offs that began late last year and has been continuing on and off ever since. Local church volunteers have been working to accommodate them, but their resources have become increasingly strained.

Many of the migrants arriving Friday had been in the United States less than 24 hours. Some had waited at a port of entry at the Arizona-Mexico border for about two months to make their case for asylum.

They all had in their possession immigration-related documents given to them by U.S. Immigration and Customs Enforcement. Many of them hadn't showered or didn't have a change of clothes, food and money. Some said they felt lucky volunteers showed up to help them provide temporary housing or a phone to call friends and relatives already living in the United States.

Friday's ICE drop-off is part of a continuing humanitarian crisis that has been unfolding in the past several months and has been fueled by what activists say are the Trump administration's immigration policies. At the same time, churches that have offered resources have been overwhelmed by the number of migrants being dropped off and lack of support from ICE officials, volunteers said.

'Like they're animals'

"I don't understand the lack of humanity from ICE. Just to drop them off here like they're animals," said Lynn Cordova, who had the day off and rushed to the bus station to help the migrants get to churches.

ICE has been coordinating with local churches and other organizations to drop off migrants.

An ICE spokesman on Friday referred all questions to Greyhound.

Greyhound officials issued the following statement late Friday:

"Over the past several days, Greyhound has been working diligently to attend to and accommodate passengers sent to our Phoenix terminal by ICE,'' the statement said. "While the arrival of these passengers is unexpected, we are committed to continuing operations as usual as we transport all passengers to their destinations."

On Thursday, ICE released statistics that show the extent of the crisis. The data doesn't show the full scope of the issue because ICE officials began to collect the number in December, even though they had been releasing migrants before then.

Since Dec. 21, according to the data, ICE has released 84,500 migrant family members. Of that, 14,500 have been released in the Phoenix area, 37,500 have been released in communities in south Texas, 24,000 in El Paso and 8,500 in San Diego, the data shows.

Although the Trump administration has applied draconian policies to deter Central Americans from entering the U.S., statistics show migrants continue to enter, legally through ports of entry or illegally.

Family apprehensions up

Border-wide, migrant-family apprehensions through February of the current budget year totaled 136,150, which is up 300 percent compared with the same period last year and exceeds the total number of migrant-family apprehensions for all of the previous year, according to Border Patrol statistics.

In the El Paso area, family apprehensions have spiked by more than 1,600 percent, the largest increase of any area along the border.

In the Tucson sector, family apprehensions are up 237 percent. They are up 230 percent in the Yuma area.

Among the people dropped off Friday was a 28-year-old man who fled Chiapas, which borders Guatemala and is among the poorest states in Mexico. It has also been plagued by natural disasters, such as hurricanes and earthquakes partially destroying land used to harvest beans and corn, which the community depends on.

The man, who declined to identify himself by name out of fear that immigration officials may punish him, said the recent violence coming from organized crimes forced him to leave Chiapas.

Narrow requirements for asylum

He came with his 24-year-old wife, 4- and 1-year-old sons. Their final destination is Encinitas, California, where he has a friend who would help his family settle.

But they still have to wait for immigration officials to notify them if they can apply for asylum, which typically requires the applicant to meet narrow and specific terms in order to qualify.

Among the requirements, a person has to prove they would be prosecuted in their home countries for political or religious beliefs. If immigration officials believe the person's story at the initial screening, the person can continue onto the next step, usually allowing them to enter the U.S. until their case is finalized.

On Thursday, the Ninth Circuit Appeals Court ruled the Trump administration can't swiftly deport asylum seekers who fail the initial screening. The ruling allows migrants constitutional protections such as appealing immigration officials' decision of denying asylum protection to them, providing them another chance to make a case as to why the U.S. should take them in.

Like others in the group, the man's family didn't know where they were being dropped off and had no money to buy another bus ticket.

'It's becoming a real crisis'

But volunteers rushed to get there.

By 10 a.m., some volunteers were there with food — beans, rice, eggs and tortillas — to feed the families. By 11:30 a.m., the migrants were taken by volunteers in white buses to undisclosed churches. The volunteers didn't want to say where the migrants were being housed because they feared protesters would harass them.

Despite the strained resources among churches helping migrants, volunteers continue to help new arrivals navigate their situation until they are reunited with a friend or family member.

Ginger Torres, a spokeswoman for the Last Mile AZ, one of many organizations monitoring Greyhound bus stations to help migrants, said she wants Phoenix's elected officials to step up and help with resources.

She said that if ICE is depending on volunteers to help, the federal government should assist with money so that organizations can get more resources to house or provide food for migrants. She also said ICE should help migrants arrange travel plans so migrants won't be left wandering the streets.

"It's becoming a real crisis," said Aliza Young, who is also with Last Mile AZ. "ICE is relying on people in the community to get people to their next immigration hearing."

Republic reporter Daniel González contributed to this article.

Uriel Garcia covers public-safety issues in Arizona. Reach him at uriel.garcia@azcentral.com. Follow him on Twitter @ujohnnyg.