Police in the US state of New Mexico have rescued 11 malnourished children who were being kept in squalid conditions in a remote desert compound.
They said the children, aged one to 15, had no shoes, were wearing rags and "looked like Third World refugees".
Five adults were found at the scene, including two heavily armed men.
Police searched the site after receiving a message from a third party that read: "We are starving and need food and water."
On Sunday, Taos County Sheriff Jerry Hogrefe "swore an affidavit for arrest warrants charging 11 counts of child abuse for all five adults related to the neglect and abuse of the children involved".
Each count of child abuse is a felony.
It is not clear how the group ended up at the compound in Amalia, near the state's border with Colorado.
Police described the compound as a small underground caravan covered by plastic, with no running water or electricity.
Sheriff Hogrefe told ABC News the children were hungry, thirsty and filthy.
"I've been a cop for 30 years. I've never seen anything like this. Unbelievable," he said.
"They were skinny, their ribs showed, they were in very poor hygiene and very scared."
No fresh water was found at the site, and the only food there was a few potatoes and a box of rice, police said.
Two armed men, Siraj Wahhaj and Lucas Morton, were arrested at the scene, and charged with several counts of child abuse.
Three women, believed to be the children's mothers, were "arrested without incident" and booked in the Taos Adult Detention Center, according to the Sheriff's Office.
Police have not explained what connection the women - named as Jany Leveille, 35, Hujrah Wahhaj, 38, and Subhannah Wahhaj, 35, - have to each other.
Mr Hogrefe told ABC it appeared the women and children "were brainwashed and feel great intimidation from the men that were in control of this facility".
The 11 children have been taken into care by local social services.
Mr Wahhaj is also wanted on suspicion of abducting his three-year-old son, but the boy was not among the group found at the compound, US media report. It was the search for the boy that led to the arrests on Friday.
According to the sheriff's office, law enforcement officials are still searching for the boy, who turned four on Monday.
Police said they had been aware of the compound for some time but had to wait for a search warrant to be issued before entering, as the occupants were "most likely heavily armed and considered extremist of the Muslim belief".
Mr Wahhaj was armed with an AR-15 rifle and four pistols when they encountered him, they said.
There were bullet casings covering the ground on site, as well as a makeshift shooting range and 150ft tunnel, KOB 4 News reported.