Oxfam's chief executive has apologised following allegations of improper conduct by staff in Haiti following the 2010 natural disaster that killed 220,000, injured 300,000 and left 1.5 million homeless, .
'They would invite women for parties, we knew they weren't just friends but something else, ' said an anonymous former employee.
"The International Development Secretary is reviewing our current work with Oxfam and has requested a meeting with the senior team at the earliest opportunity", a DFID spokeswoman said.
The chief executive said: "With hindsight, I would much prefer that we had talked about sexual misconduct".
"Since the Haiti case in 2011 we have introduced a range of measures to prevent sexual abuse and misconduct happening in the first place and improve how we handle any allegations", the charity said.
Charities, including Oxfam, have been told they will have funding withdrawn if they fail to comply with authorities over safeguarding issues.
Oxfam said it was "dismayed by what happened" and would fully cooperate with authorities.
Oxfam chief executive Mark Goldring apologised on Saturday, saying he was "deeply ashamed of Oxfam's behaviour".
"The hundreds of thousands of people that support Oxfam every month are compromised by this, and to everybody I do apologise".
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They initially said they were investigating misconduct, and when they concluded that report they did not tell us the nature of these events.
"But I'm not apologising for the fact that Oxfam continued its work in Haiti".
Speaking to BBC1's The Andrew Marr Show: "I think it's shocking and it doesn't matter how good the safeguarding practices are in an organisation, if that organisation does not have the moral leadership to do the right thing, and where in particular they have evidence of criminal activity to pass that information to the relevant authorities including prosecuting authorities, that's an absolute absence of leadership".
In a statement on Friday, Oxfam neither confirmed nor denied The Times newspaper report but said its misconduct findings had "related to offences including bullying, harassment, intimidation and failure to protect staff as well as sexual misconduct".
Ms Mordaunt said the charity had also "categorically" stated to the Department for International Development (DfID) that no harm was done and beneficiaries were not involved.
When asked if she believed Oxfam had failed in its moral leadership, she replied: "Yes, I do".
Ms Mordaunt has written to all United Kingdom charities which receive United Kingdom aid urging them to declare any safeguarding issues, and will also meet the Charity Commission this week to discuss the regulation of organisations overseas.
Individuals closely implicated in the scandal went on to take leadership roles in other charities, which were not informed of the reasons they left Oxfam and even given glowing references, the investigation added.
Ms Mordaunt said: "I am writing to all United Kingdom charities which receive United Kingdom aid, insisting that they spell out the steps they are taking to ensure their safeguarding policies are fully in place and work properly, declare all safeguarding concerns they are aware of, and confirm they have referred all concerns they have about specific cases and individuals to the relevant authorities".