Oxfam abuse victims were sent back to war zones after raising complaints against aid workers, it was claimed in an official report exposing the scale of the scandal that engulfed the charity.

The report, by the Charity Commission, accuses Oxfam of underplaying the scale of allegations made by victims in Haiti and the UK in an attempt to protect the charity’s reputation and keep donations coming in.

It found that the charity failed to respond adequately to allegations that aid workers in Haiti were sexually abusing women whom they were supposed to be helping.

It also found that 16 child volunteers in UK high street stores had complained of being victims of abuse. However the report found that Oxfam “tolerated poor behaviour”.

The Charity Commission, which has been investigating Oxfam since last year, concluded that the charity’s approach to the allegations was marked “by a desire to protect its reputation and donor relationships”.

One allegation in the report, published yesterday, said: “Beneficiaries who raised complaints against Oxfam GB and UN staff were removed from camps and repatriated back to conflict zones by staff who wanted to protect their colleagues.”

The report came a year after allegations emerged that Oxfam aid workers had used prostitutes in Haiti following the 2010 earthquake. The claims resulted in more than 7,000 people cancelling their donations, forcing Oxfam to make £16 million of cuts to aid projects.