Vietnamese children rescued from traffickers in Britain are vanishing from local authority care, with many feared at risk of re-enslavement by criminals, charities said on Friday.

More than 150 Vietnamese minors have disappeared from care and foster homes since 2015, with almost 90 others going missing temporarily, according to the Times newspaper.

Anti child trafficking organization ECPAT U.K. said its own research showed 28 percent of all trafficked children in care went missing at least once, with Vietnamese children the most likely to abscond.