Four UN peacekeepers from Bangladesh have been sent home for sexual misconduct committed in Sudan, said a UN spokesperson.
The UN on Thursday said another 11 peacekeepers from other countries were also under investigation.
Some of the probes were for sexual abuses, but the specific charges and nationalities of those involved were not revealed because investigations were underway.
The charges of sexual misconduct were lodged against the peacekeepers by the UN mission in Sudan, which maintains a large peacekeeping operation involving about 10,000 troops to monitor the 2005 peace agreement between Khartoum and rebels in southern Sudan.
The spokesperson said the Bangladeshis were repatriated after they were charged with the crime.
The UN has imposed a zero tolerance on sexual misconduct in peacekeeping operations around the world.
Dozens of cases had been prosecuted by the UN in past years, particularly in UN missions in the Democratic Republic of Congo.
In most cases, the culprits were sent home to face penalties from their own governments.