Venezuela blackout has killed 21 people, opposition leaders say

* Six of the dead are babies and numbers will rise, opposition say* Opposition to hold emergency debate as power cut continuesAn injured man is carried by paramedics inside Miguel Perez Carreno hospital in Caracas during the worst power outage in Venezuela’s history. Photograph: Matias Delacroix/AFP/Getty ImagesAt least 21 people – six of them babies – have so far died as a result of Venezuela’s shattering nationwide blackout, opposition leaders have claimed as they prepa