Ethiopia is mourning the death of prime minister Meles Zenawi.
He ruled the west African nation for two decades.
His administration was one of America's staunchest allies in the continent.
But now there are concerns that his passing could leave a power vacuum.
Marco Werman speaks with E.J. Hogendoorn, of the non-profit International Crisis Group.
They have just issued a report that warns of serious consequences.
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