The aid sector is guilty of “complacency verging on complicity” over sexual abuse and exploitation that was an open secret for years before the Oxfam scandal, MPs have found.

The International Development Committee said claims of surprise were “not appropriate” after revelations that senior aid workers had used prostitutes in Haiti and then been able to gain employment in other crisis zones.

A six-month investigation found that abuses by aid workers and United Nations peacekeepers are still happening in developing countries, including in warzones and refugee camps where human trafficking and prostitution are common.