UNITED NATIONS (AP) — Sudan’s refusal to arrest President Omar al-Bashir and three others accused of war crimes in Darfur is “a direct challenge” to the U.N. Security Council, and it should now consider asking all countries and regional organizations to carry out the arrests, the International Criminal Court’s chief prosecutor said Tuesday.

Luis Moreno-Ocampo conceded that council discussions of other possibilities to arrest the four Sudanese, including seeking help from member states and regional bodies, “will be problematic.”