from the linked Globe article:

From the police department, the boy was taken to ICE’s holding facility in Burlington on Thursday evening, where he spent a night before being transferred by car to the Northwestern Regional Juvenile Detention Center in Winchester, Va., on Friday morning, his mother said. The juvenile facility is more than 500 miles away from Everett.

The boy is a 7th-grader at Albert N. Parlin School in Everett, his mother said. The teen and his family, who are Brazilian nationals, have a pending asylum case and are authorized to work legally in the United States, Lattarulo said.

In his ruling, Stearns mentioned the boy’s age, stating he’s detained “in the company of unrelated adult detainees.” At the time, the boy was still believed to be in Massachusetts.

“I’ve never done a bond or a habeas for a kid this young, ever. This is the youngest,” Lattarulo said.

ICE arrested Everett 13-year-old

The boy’s mother, Josiele Berto, was called to pick her son up from the Everett Police Department on Thursday, the day he was arrested.

^{The Boston Globe}

“At the time of the detainment, ICE had no knowledge of the individual’s age.”

So, they simply detain random people?