Prominent Egyptian youth leader Ahmed Duma was arrested Tuesday and ordered detained for four days for organizing an unauthorized demonstration and assaulting security forces, judicial sources said.

Duma is the third pro-democracy activist to be detained within a week, as Egyptian authorities widen their crackdown on protesters since interim president Adly Mansour passed a law on November 24 that bans all unauthorized demonstrations.

Egyptian poet Ahmed Fouad Negm, renowned for his revolutionary poetry and outspoken criticism of Arab political leaders, died on Tuesday at the age of 84, friends said.

"Ahmed Fouad Negm passed away. He was 84," publisher Mohammed Hashem told Agence France Presse.

Muslim Brotherhood-linked theologian Yusuf al-Qaradawi has resigned from the governing body of Cairo's Al-Azhar, accusing the top Sunni seat of learning of supporting Egypt's military-installed government.

"I submit my resignation," Qaradawi wrote on Twitter and his Facebook page on Monday, accusing the Grand Imam of Al-Azhar, Sheikh Ahmed al-Tayyeb, of "abusing the authority of the office to support the military coup."

Security forces defused a bomb placed in a car and primed to explode on a roadside near the Egyptian capital on Monday, security officials said.

The interior ministry said the stolen car was detected near a petrol station on the road to the city of Suez.

An Egyptian prosecutor ordered Monday the detention of a prominent secular activist for taking part in an unauthorized protest, just a day after he was freed over a similar case, state media reported.

Ahmed Maher, founder of the April 6 movement which was one of the main groups that spearheaded the revolt against Hosni Mubarak in 2011, had turned himself in on Saturday after an order for his arrest.

Egypt's draft constitution, which has been approved for a referendum, would consolidate the power of the military, which had promised a "democratic transition" when it ousted Islamist president Mohammed Morsi.

The document has raised fears among Islamists and secular activists alike of a return to a police state less than three years after Hosni Mubarak, an air force commander who went on to rule Egypt for 30 years, was toppled by pro-democracy protests.

Clashes erupted in Cairo Sunday between residents and police after a policeman shot dead a student following an argument, security officials said.

The student was shot dead by the policeman after the two had a heated argument when their vehicles crashed into each other in the capital's northern Amiriya neighborhood, they said.

Egypt's constitution-drafting panel approved a charter Sunday that preserves the military's wide-ranging powers, including the ability to try civilians, as police fired tear gas to disperse Islamists in Tahrir Square.

The charter will be submitted to a popular referendum early next year that has been billed as the first stage in a "democratic transition" promised by the military-installed authorities following the ouster of Islamist president Mohammed Morsi in July.

Egyptian authorities on Sunday freed a prominent secular activist but extended the detention of another after the two were arrested for holding unauthorized demonstrations, judicial sources said.

Ahmed Maher, founder of the April 6 movement which was one of the main groups that spearheaded the revolt against Hosni Mubarak in 2011, had been released, the sources said.

Human Rights Watch urged Sunday Egypt's military-installed government to free five aides of ousted Islamist President Mohamed Morsi, who have been detained since July without any legal basis.

"Almost five months later, the government has yet to formally acknowledge their detention or disclose their fate or whereabouts, conditions that constitute enforced disappearance," the rights watchdog said in a statement,