The ouster of Gabon’s president by mutinous soldiers appears to have been well organized and capitalized on the population’s grievances against the government as an excuse to seize power, analysts said.

Soldiers on Wednesday ousted President Ali Bongo Ondimba, whose family has ruled the oil-rich country in Central Africa for more than five decades. The coup leaders accused Bongo of irresponsible governance that risked leading the country into chaos and said they put him under house arrest and detained several Cabinet members.

Meanwhile, the African Union Peace and Security Council met Thursday and announced the immediate suspension of Gabon from “all activities of the AU, its organs and institutions” until the country restores constitutional order.

The head of Gabon’s elite republican guard, Gen. Brice Clotaire Oligui Nguema, was announced on state TV as the nation’s new leader hours after Bongo was declared the winner of a weekend presidential election that observers said was marred with irregularities and a lack of transparency.