Britain-based charity organization Oxfam says it has dismissed nearly two dozen staff members over allegations of sexual abuse in the last year.

The leading charity group sacked 22 members of its staff after dealing with 87 claims of sexual exploitation and abuse, involving around 5,000 workers in the year ending April 2017, a 36 percent increase in one year.

Oxfam said that about three-quarters of the claims had culminated in disciplinary action, adding that it referred 53 claims to the police and conducted internal investigations for 33 claims.

“Oxfam treats all allegations of sexual abuse and exploitation very seriously,” it said in a statement, noting that data on allegations of sexual abuse by staff had been published in its annual reports.

The dismissals came as campaigners and rights activists called on world governments to take a closer look at the funding they provide to aid and charity groups.