Col Malick Diaw becomes head of the interim legislative body, the National Transition Council.
President Sall leads tributes to the player who scored the goal that beat France in the 2002 World Cup.
England's one-day international series against South Africa will begin on Sunday after the hosts' players tested negative for Covid-19.
"It is really scary. It is really difficult," a resident of the Tigray capital, Mekelle, shouts down the line.
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