The former trustees of Prince Harry's African charity Sentebale have told PEOPLE in a statement that they are 'gravely concerned' about the future of the organization following the findings of a probe into the charity going public.

Sentebale was founded by Harry in 2006 and aimed to address the impact HIV and Aids has on young people living in Botswana and Lesotho. Harry set it up with Prince Seeiso, whose mother died in 2003, after he visited Lesotho during his gap year.

The Sentebale scandal started in March when Prince Harry abruptly stepped down from his role as a patron and trustee.