Sudan's President Omar al-Bashir has left Nigeria amid calls for his arrest on charges of genocide in Darfur. A human rights group on Monday filed a case in a Nigerian court to try to compel the government to arrest Mr Bashir and hand him over to the International Criminal Court (ICC). Mr Bashir was in Nigeria for an African Union-organised health summit due to end on Tuesday. Sudan's embassy in Nigeria said he left because he had another engagement. The ICC issued an arrest warrant for Mr Bashir in 2009, accusing him of committing genocide during the 10-year conflict in Sudan's Darfur region.