The International Committee of the Red Cross (ICRC) said 23 staff members had left since 2015 over sexual misconduct, making it the latest humanitarian organization to be affected by abuse allegations shaking the aid sector.

"Since 2015 we've identified 21 staff members who were either dismissed for paying for sexual services or resigned during an internal inquiry. Another two staff members suspected of sexual misconduct did not have their contracts renewed," ICRC Director-General Yves Daccord said in a statement published on Friday.

"I am deeply saddened to report these numbers," Daccord said in the statement, adding the ICRC was taking action to make sure all incidents would be reported and handled properly.

Daccord said because of the decentralized nature of the sprawling aid agency, which has more than 17,000 employees worldwide, it is possible that other incidents were not reported or properly handled.

The ICRC, which has more than 17,000 staff worldwide, bans its staff from paying for sexual services even in countries where prostitution is legal, it said.

The aid sector has been shaken by a wave of allegations of sexual misconduct. Earlier this week, British charity Oxfam's country director in Haiti admitted to using prostitutes at his residence during a relief mission.

The United Nations' peacekeeping missions, agencies, funds and programs as well as implementing partners have also been embroiled in sexual exploitation and abuse allegations, with the deputy head of the U.N. agency for HIV/AIDS becoming the latest official to leave.

Plan International UK has also disclosed wrongdoing. The charity group says it has confirmed six cases of sexual abuse of children by staff, volunteers or partner organizations and has pledged to do more to prevent misconduct.

Charities in the U.K. have been under increased scrutiny in recent weeks following allegations that senior staff from the British aid organization Oxfam used prostitutes and downloaded pornography while working in Haiti after the 2010 earthquake.