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NAIROBI, 31 August 2010 ( IRIN) - Three Russian pilots released on 30 August, two days after they were kidnapped in Darfur, were only the latest in a string of foreigners associated with humanitarian operations there to be abducted this year. In all, some 23 aid workers, peacekeepers and pilots have been abducted at gunpoint, for periods ranging from three to 147 days (see table). The trend led UN Secretary-General Ban Ki-moon to speak out earlier this month, saying: "Continued attacks on UNAMID [UN-AU Mission in Darfur] peacekeepers and abductions and mistreatment of UN staff and humanitarian workers will only aggravate the situation" in Darfur. Humanitarian operations in the region have also been affected [ http://www.irinnews.org/Report.aspx?ReportId=83370 ] by the Sudanese government's expulsion of 13 international aid agencies in January 2009 following the arrest warrant for alleged crimes against humanity issued against President Omar al-Bashir. cp/am/mw © IRIN. All rights reserved. More humanitarian news and analysis: http://www.IRINnews.org