Russia air firms' staff guilty of sex abuse.

The U.N. peacekeeping department said it temporarily suspended the contracts of two Russian air transportation firms active in Sudan and Democratic Republic of the Congo after several staff were charged with sexual abuse of local residents.

The sexual abuse was "extremely serious, very, very bad stuff," a source familiar with the decision of the U.N. Department of Peacekeeping Operations (DPKO) told Reuters on condition of anonymity. He did not offer any specific details.

DPKO spokesman Kieran Dwyer confirmed that some allegations of severe sexual misconduct against several employees of UTair Aviation and Nefteyugansk United Airline, which provide airplane and helicopter services for U.N. missions in Sudan's western Darfur region and in Congo, were found to be true.

"We are fully aware of the incident you are referring to and in this case the U.N. has taken appropriate action," Dwyer said in a statement to Reuters.

"An investigation was conducted and concluded that some allegations against certain contract personnel were substantiated," he said. "The two air operators were temporarily suspended and the employees involved were dismissed and barred from future participation in any U.N. missions."

UTair and Nefteyugansk are operating flights again for the United Nations, but are being closely monitored by the United Nations, Dwyer said. The two Russian firms did not respond to requests for comment. It was unclear how long their contracts were suspended.

"An independent compliance monitor was engaged to assess, monitor and report to the U.N. on the vendors' programs, policies, measures and procedures to prevent their personnel from engaging in sexual exploitation and abuse as defined in the Secretary-General's policy," he said.

If the companies fail to convince the compliance monitors and the United Nations that they have taken measures to prevent such misconduct in the future, Dwyer said the world body "could bar these companies from doing further business with the U.N."