TDN World Desk: The United States helds the world’s highest rate of children in detention, including more than 100,000 in immigration-related custody that violates international law, the author of a United Nations study said on Monday.

Worldwide more than 7 million people under age 18 are held in jails and police custody, including 330,000 in immigration detention centres, independent expert Manfred Nowak said.

“The United States is one of the countries with the highest numbers – we still have more than 100,000 children in migration-related detention in the (U.S.),” Nowak told a news briefing, Reuters reports.

“Of course separating children, as was done by the Trump administration, from their parents and even small children at the Mexican-U.S. border is absolutely prohibited by the Convention on the Rights of the Child. I would call it inhuman treatment for both the parents and the children.”

There was no immediate reaction from U.S. government. Novak said U.S. officials had not replied to his questionnaire sent to all countries.