Actress quits Oxfam over Haiti sex claims
Actress Minnie Driver has stood down from her role as a celebrity ambassador for Oxfam.
This follows claims that staff for the charity in Haiti and other countries paid vulnerable people for sex.
In a statement Ms Driver said she was "nothing short of horrified" by the allegations, BBC reports.
Oxfam said it was "grateful" for Ms Driver's commitment and that it was "more committed now than ever to learn from our mistakes".
The British charity is accused of concealing the findings of an inquiry into claims staff used prostitutes while delivering aid in Haiti in 2011.
The actress, best known for the films Good Will Hunting, Grosse Point Blank and Hope Springs, said although she could not continue her 20 years of involvement with Oxfam, she would work against "social and economic injustice".
She added: "I certainly will not let the abhorrent mistakes of a troubling organisation stop me or anyone else from working with good people in this space to support a population of human beings around the world that needs our help."
The actress later said on Twitter that she was "devastated by the response" of Oxfam which she had been "raising awareness for since I was nine years old".
Ms Driver had been to countries including Cambodia and Thailand in her role as a celebrity ambassador, and also performed at a fundraising concert for Oxfam.
The Charity Commission has launched a statutory inquiry into Oxfam - which denies a cover-up - but details of its scope have not yet been released.
The commission is also looking into claims that Roland van Hauwermeiren - the charity worker at the centre of the sexual misconduct scandal in Haiti - was employed by Oxfam two years after he left another aid agency, because of concerns about his behaviour.
A former colleague has told the IRIN website that van Hauwermeiren was investigated by British health charity Merlin after it was alleged that he used prostitutes in Liberia in 2004.
Merlin later merged with Save The Children, which says it does not have access to Merlin's records.
"We have immediately contacted Save The Children to establish whether they have any knowledge of and/or hold any records about these reports either at the time of the merger or subsequently and if so to ask them to urgently disclose this information to us," a Charity Commission spokesperson said.
The commission said its own records did not go back to 2004.
Oxfam said that with 10,000 NGOs working in Haiti alone in 2011, "it was unfortunately not possible for Oxfam to ensure that those found guilty of sexual misconduct were not re-employed in the sector".