Umaru Yar'Adua faces calls to quit

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More than 50 Nigerian public figures have called on President Umaru Yar'Adua to resign, saying ill health has impaired his judgement.

Several Nigerian newspapers carried a statement asking him to step down that was signed by senior political figures and democracy activists, among others.

Mr Yar'Adua, who has several long-term ailments, is currently being treated in Saudi Arabia for a heart problem.

The government has not yet reacted to the statement.

BBC Africa analyst Mary Harper says the wording of the statement is blunt and to the point.

It says the president's illness "has created a dangerous situation whereby no-one is in charge of the affairs of state".

The statement talks about "a vacuum of leadership" whereby ministers are "engaged in infighting" and "routinely flout the orders of the president".

Heart and kidney problems
Many of the people who have signed the statement are prominent figures in Nigeria - including Aminu Bello Masari, a former speaker of the House of Representatives, and Ken Nnamani, a former Senate president.

Our correspondent says their words reflect the general mood in the country, where there is real concern that the president's recurring health problems have rendered him frequently unable to do his job.

She says the front pages of Nigeria's newspapers regularly print photographs of a man who is obviously in ill health - his face deeply lined and ashen.

Although he has missed several important events, officials had kept silent on what was wrong with Mr Yar'Adua.

Last week they finally confirmed he is suffering from acute pericarditis - an inflammation of the lining of his heart.

He is also known to have a kidney problem, so it is likely that there will be more calls for something to be done to ensure that Africa's most populous nation has a leader strong enough to keep things under control.