Egyptian security forces on Monday fired tear gas to disperse students protesting in support of ousted Islamist president Mohmamed Morsi, security officials said.

The protesters marched outside the campus of Al-Azhar University in Cairo and blocked a main road as they chanted against the military that overthrew Morsi in July amid massive protests against his rule.

Gunmen on Monday killed three policemen in Egypt, where attacks against security forces have been on the rise in the face of a bloody crackdown against Islamists, security officials said.

The assailants opened fire on the policemen who were posted near the University of Mansura in Egypt's Nile Delta region, before fleeing, one source said.

Stability in the Gulf monarchies is essential for Egypt's security, Prime Minister Hazem Beblawi said Sunday, a day after the United Arab Emirates pledged Cairo an extra $3.9 billion (2.8 billion euros) in aid.

The UAE and other Gulf monarchies backed the July 3 overthrow of Egypt's Islamist president Mohammed Morsi and have vowed to help the interim government address the economic devastation wrought by two years of political turmoil.

Jihadists have released a video of a suicide bombing in which an ex-army major reveals himself as the attacker who tried to kill Egypt's interior minister in September.

A senior interior ministry official confirmed the bomber, Walid Badr, was a major in the military before his expulsion in 2005 for "extremist" views.

The Israeli foreign ministry has named Middle East specialist Haim Koren as the Jewish state's next ambassador to Egypt, a spokesman told Agence France Presse on Sunday.

He did not say when the appointment take effect.

Egypt's closure of tunnels used to smuggle goods into the Gaza strip has caused monthly losses of $230 million (170 million euros) to its economy, a Hamas official said Sunday.

The "closure of the tunnels caused heavy losses to the industry, commerce, agriculture, transport and construction sectors" of around $230 million monthly, said Hatem Oweida, deputy economy minister for the Islamist movement Hamas that governs the strip.

The United Arab Emirates agreed Saturday to give Egypt's military-installed government another $3.9 billion in aid after transferring $1 billion in July, the official WAM news agency said.

The UAE and other Gulf monarchies were staunch supporters of the July 3 overthrow of Egypt's first Islamist president, Mohammed Morsi, and have vowed to help the interim government address the economic devastation wrought by two years of political turmoil.

Egyptians packed cafes Friday to watch the return of famed TV satirist Bassem Youssef, wondering if he would dare to mock the army that toppled Islamist president Mohammed Morsi.

After four months off the air, Youssef -- known as 'Egypt's Jon Stewart' after modelling his show on the U.S. comedian's popular fake news program -- returned after a summer break to an Egypt fiercely split between supporters of the military and Islamist backers of the ousted Morsi.

A Cairo court Saturday threw out a lawsuit against Nobel Peace Prize laureate Mohammed ElBaradei over his resignation as Egyptian vice president in protest at a bloody crackdown on Islamists.

A lawyer filed the suit in August against ElBaradei, who left Egypt after resigning, accusing him of having betrayed the trust of the opposition National Salvation Front which he represented.

Egypt is to shorten a night-time curfew imposed on Cairo and 13 other provinces by one hour starting Thursday, the cabinet announced.

The curfew will be from 1:00 am (2300 GMT) to 5:00 am, except on Fridays when it will begin at 7:00 pm (1700 GMT), a cabinet statement said.