Almost all the Vietnamese children who arrived in Dutch asylum centers in recent years disappeared and were probably trafficked, the Dutch government adviser on human trafficking has said.

Eighty unaccompanied minors from Vietnam went missing from government asylum centers in the Netherlands between 2015 and 2019, according to an investigation by the Dutch National Referral Site for Human Trafficking released this week.

That represents 97 percent of the total arrivals from Vietnam. Most are thought to have traveled on to Britain, where a study last year found that Vietnamese children were being made to work in nail salons, cannabis cultivation or prostitution.