mullah omar
The Taliban promptly denied the claims.
He called the decision to conceal ex-leader Mullah Omar's death a "historic mistake."
Former leader Omar's death was announced last week.
An expert describes challenges for the militants' new leader.
WHAT'S HAPPENING
The son of ex-leader Mullah Omar accused him of a power grab.
Has the leader really been dead for years?
Reports swirled this week of Mullah Omar's death.
Uncertainty looms after reports of Taliban leader Mullah Omar's death.
Long-awaited negotiations are set to begin Friday.
The one-eyed leader had not been seen in public since fleeing the invasion over the border into Pakistan.