Militants say President Umaru Yar'Adua's absence in Saudi Arabia is being used to delay oil wealth reforms Claims by Nigerian militants that they staged an attack on an oil installation, breaching a five-month ceasefire, have deepened fears that the country is on the verge of a constitutional crisis. Nigeria, which in 1999 ended a 40-year era of military dictatorship, is in the midst of a power vacuum in the absence of President Umaru Yar'Adua, who has been in hospital in Saudi Arabia for...- full story