Matt Hancock, the culture secretary who is responsible for charity regulation, said: "These allegations are deeply shocking and Oxfam must now provide the Charity Commission with all the evidence they hold of events that happened in Haiti as a matter of urgency.

"The reported historic behaviour of senior aid workers is abhorrent and completely unacceptable. Charities must ensure that they have the highest standards of transparency and safeguarding procedures in place to protect vulnerable people and maintain the trust of the public."