Egyptian police said Saturday that four Islamists were killed in an accidental explosion while preparing bombs south of the capital.

Police said the suspected militants were members of the blacklisted Muslim Brotherhood movement of former Islamist president Mohamed Morsi, whom the army toppled in 2013.

Army chief Gen. Jean Qahwaji is expected to attend a meeting for Arab military leaders in Cairo this week following an agreement at an Arab summit to establish a joint force, al-Akhbar daily reported on Tuesday.

Qahwaji will represent Lebanon at Wednesday's meeting which Arab League chief Nabil al-Arabi has called for, said the report.

Arab military chiefs will meet this week in Cairo to discuss the forming of a joint military force to fight the region's growing extremist threat, an Arab League official said Sunday.

After Arab League leaders agreed to create such a force at a March summit in Egypt, army chiefs from member states will hold talks on Wednesday on details of how the force will be created, its role and its financing, a League source told AFP.

An Egyptian court Sunday sentenced 11 football fans to death after a retrial over a 2012 stadium riot in the canal city of Port Said that left 74 people dead.

An appeals court had ordered the retrial of 73 defendants in February last year after rejecting a lower court verdict sentencing 21 people to death for being involved in the incident.

Six months after donors pledged billions for devastated Gaza, only a quarter of the funds have materialized and not one destroyed home has been rebuilt, a coalition of aid groups said in a report Monday.

The report, "Charting a New Course: Overcoming the Stalemate in Gaza", warns that further conflict is likely unless the world takes a fresh approach to the battered Palestinian enclave, by releasing the promised funds, pushing for a permanent ceasefire and pressuring Israel to end its nine-year blockade.

The Cairo-based top Sunni Muslim body Al-Azhar on Saturday condemned the massacre of nearly 150 people at Kenya's Garissa University by Somalia's Shebab Islamists.

Four militants from the al-Qaida-linked group killed 148 people, 142 of them students, and wounded at least 79 at Garissa university after a day-long siege on Thursday.

A bomb exploded near a checkpoint on a bridge in an affluent Cairo neighborhood on Sunday, killing a policeman, Egyptian police said.

The bomb had been placed next to the checkpoint on a side of the May 15 bridge in the Zamalek neighborhood, the officials said.

Two people were killed Thursday when assailants threw a bomb at the entrance of a youth leisure center on the outskirts of Cairo, Egyptian police said.

Police investigators could not confirm whether it was a criminal act or part of a bombing campaign by militants since the army's ouster of Islamist president Mohamed Morsi in July 2013.

Egypt's state prosecutor Tuesday referred to trial 16 suspects accused of clashing with police that led to a deadly Cairo football stadium stampede, blaming the Islamist opposition for the violence.

At least 19 people died in the stampede after police fired tear gas at fans who tried to push their way into the stadium on February 8.

A small bomb killed a street cleaner in the Egyptian capital Cairo late Saturday, a security official said.

The blast occurred near a tram track in the working class neighborhood of Mattariya, a stronghold of supporters of ousted Islamist president Mohamed Morsi.