Umaru Yar'Adua, the president of Nigeria, remains in ill health, bringing the country's political stability into question.

Yar'Adua is seeking medical treatment at a hospital in Saudi Arabia, three weeks after falling ill.
 
As yet, no officials have been allowed to visit him in hospital, leading to growing speculation over the state of his health and whether he will return to power. 
 
Yvonne Ndege reports from the Nigerian capital, Abuja.

Source: Al Jazeera