Gunbattles raged Wednesday on the streets of Yemen's capital, killing 39 people, witnesses said as a truce between security forces and tribesmen collapsed, residents fled and embassies bolted their doors.

A medic at Jumhuriya hospital said 37 people, most of them combatants, were killed in overnight clashes in Sanaa, while an Agence France Presse photographer said the bodies of two other tribesmen were taken to Al-Ulum hospital during the day.

Britain believes that Syria should be reported to the U.N. Security Council over its alleged illicit nuclear activity, Britain's ambassador to the International Atomic Energy Agency (IAEA) said Wednesday.

In a restricted report circulated to member states last week, the U.N. watchdog said it was "very likely" that a remote desert site in Syria bombed by Israeli planes in 2007 was indeed a covert nuclear reactor, as alleged by the United States.

Ousted Egyptian president Hosni Mubarak and his two sons, Alaa and Gamal, are to face trial on August 3 on charges of ordering the killing of protesters and fraud, a judicial source told Agence France Presse Wednesday.

The trio will be tried by the North Cairo criminal court and the hearing will be presided by Judge Ahmed Rifat, the source said.

The Gulf state of Kuwait withdrew diplomatic staff from its embassy in the Yemeni capital Sanaa on Wednesday because of the security situation, the foreign ministry said.

The Kuwaiti diplomats "have left Sanaa this morning (Wednesday) due to the tense security situation" in Yemen, the official KUNA news agency reported, citing an official source at the foreign ministry.

NATO allies agreed Wednesday to extend its military campaign in Libya for another 90 days until late September, the alliance said.

"NATO and partners have just decided to extend our mission for Libya for another 90 days," said NATO Secretary General Anders Fogh Rasmussen.

Syrian opposition activists opened a conference in Turkey on Wednesday to discuss ways of a regime change in their country and draw up a "roadmap" for a peaceful transition.

More than 300 dissidents, mostly exiles representing various opposition and ethnic groups, gathered at a hotel in the Mediterranean resort of Antalya, a day after Syrian President Bashar Assad decreed an amnesty for political prisoners which they dismissed as inadequate.

Bahraini activists called on supporters to hold pro-reform protests on Wednesday as a state of emergency imposed during a March crackdown on demonstrators was being lifted, one day after the king called for dialogue.

Shiites, who form a majority in the Sunni-ruled kingdom, began demonstrations on February 14 but were crushed by security forces the following month.

More than 3,000 police were deployed in and around the Holy City on Wednesday as Israelis marked Jerusalem Day to remember when they seized its Arab eastern sector 44 years ago, during the Six Day War.

"We have deployed extra police, border guards and civil guard volunteers, particularly in the eastern part of the city and in and around the Old City to maintain public order during the ceremonies," police spokesman Micky Rosenfeld told Agence France Presse.

Iranian lawmakers on Wednesday denounced President Mahmoud Ahmadinejad being a caretaker of the oil ministry and sent the report of this "violation" of the constitution to the judiciary, state television website reported.

It said Ahmadinejad violated the law by "not appointing a caretaker for the oil ministry and his maintaining (himself) as a caretaker," the website said.

French Foreign Minister Alain Juppe on Wednesday demanded "more ambitious and bolder" action from Syria after President Bashar Assad decreed a general amnesty for political prisoners.

"I fear that it might already be too late," Juppe told France Culture radio after the Syrian leader announced the amnesty following two months of deadly anti-government protests.