Reports indicate that Sudanese government has ordered that all Iranian cultural centres in Sudan be shut and their attaches sent back to Iran. No official government explanation was given. (The Guardian, September 2)
However rumours have spread in Sudan, possibly promoted intentionally by state-owned media sources which are spreading them, that these cultural attaches were expelled for apparently attempting to proselytize the Shia branch of Islam in the country which is for the most part Sunni. This however hasn't yet been confirmed nor denied by the government.
What is clear is that according to a source within the Sudanese government Khartoum has "ordered the closure of Iranian cultural centres in Sudan, and asked the cultural attache and the diplomats working in office at the Iranian cultural attache to leave Sudan within 72 hours." (Reuters Africa, September 2)