Egypt's election commission delayed the announcement of presidential election results scheduled for Thursday, June 21, as tension spiked over who will succeed ailing ousted president Hosni Mubarak after moves by the ruling military to extend powers, AFP reports.

"Egypt's election commission, headed by Judge Faruq Sultan... has decided to delay the announcement of the presidential election run-off," the official MENA news agency said late on Wednesday, without giving a new date.

The run-off, which took place on June 16 and 17 pitted Muslim Brotherhood candidate Mohamed Morsi against Mubarak's last Prime Minister Ahmed Shafiq, with both candidates claiming victory.

The election commission said it was looking into appeals from lawyers of both candidates into alleged campaign violations and disputed vote counting.

The commission said it would "continue examining the appeals... which will require more time before the final results are announced."

The announcement came amid uncertainty over the health of Mubarak, following a flurry of reports about his condition.