The commission did not set a new date, saying it needs to investigate allegations of fraud, The Wall Street Journal reported. The announcement had been set for noon Thursday.
Meanwhile, those involved in the campaigns of Mohamed Morsi, candidate of the Muslim Brotherhood, and Ahmed Shafiq, who was the last prime minister under now-imprisoned President Hosni Mubarak, claimed victory, Ahram Online reported. The two candidates were opponents in last weekend's runoff election.
Both campaigns claimed 52 percent of the vote. The Morsi campaign was supported by an association of judges and by two monitors from the Carter Center, the Journal said.
Security has been increased because of fears of violence once the official results are announced. The uncertainty has been heightened by conflicting reports on the 84-year-old Mubarak's health with an official news agency saying Tuesday he was "clinically dead" while others described him as improving or in critical condition.