Authorities have delayed today's planned announcement of the winner of Egypt's presidential election amid allegations of fraud.

The delay was announced on Egyptian state television.

Amid the atmosphere of political confusion, the Muslim Brotherhood claimed there was an organised campaign of allegations against it to mar the election and keep its candidate, Mohammed Mursi, out of the presidency.

Both Mr Mursi and former prime minister Ahmed Shafiq have declared victory.

Hundreds of Brotherhood supporters camped out in Cairo's Tahrir Square last night, denouncing the ruling military and vowing to stay in place until the parliament, dissolved last week on a court order, is reinstated.

"I can't find a justification for this delay because the role of the commission is to announce the results after they check the appeals," said one man.

"We will not leave Tahrir Square unless they announce Mohammed Mursi as president for the republic of Egypt, and reopen the parliament," said another.

Elsewhere, four former officers in a now dissolved Egyptian security agency were sentenced in absentia to life in prison.

The four were sentenced for torturing to death an Islamist during investigations into the bombing of a church on New Year's Day 2011.

A fifth officer, the only one to attend the trial, was jailed for 15 years for his role in the death of Mohamed Sayyid Bilal.

Mohamed Sayyid Bilal's body was returned to his family a day after his arrest showing signs of torture and burns.