Mr. Yar'Adua returned to Nigeria last week after spending some three months in Saudi Arabia, where he was being treated for his ailments. Mr. Jonathan, the country's Vice-President, was installed as the acting leader in his absence.

The Secretary-General continues to follow political developments in Africa's most populous nation closely, according to a statement issued by his spokesperson.

“He recognises the challenges currently confronting the country as it continues to develop its democratic system and encourages Nigeria's leadership and institutions to work together in the greater national interest, respecting the rule of law and ensuring adherence to the country's Constitution,” it stated.

“The Secretary-General wishes to encourage all Nigerians, their leaders and institutions to continue to support the efforts of Acting President Jonathan and the Government which he leads to help the country overcome its current challenges.”