The White House called Monday for an "immediate transition" of power in Yemen, where the United States fears al-Qaida could exploit political turmoil and strengthen its presence.

After four months of deadly unrest, Ali Abdullah Saleh's 33-year-old regime was teetering even before the president was wounded in an attack on his palace and flown late Saturday to neighboring Saudi Arabia for treatment.

Some 120 Syrian police officers taking part in security operations alongside the army in the northwest were killed by "armed gangs" in the town of Jisr Shugour on Monday, state-run news agency SANA quoted a Syrian official as saying.

"The armed groups are committing a veritable massacre. They have mutilated bodies and thrown others into the Assi river," state television reported earlier. "They have burned government buildings."

Protesters demanded a swift transfer of power from Ali Abdullah Saleh as his deputy said the veteran Yemeni president would return within days after surgery in Riyadh for blast injuries.

EU foreign policy Chief Catherine Ashton on Monday urged Saleh to act "in the best interest of his people" while the White House called for an "immediate transition."

The Muslim Brotherhood's political party, set up to run in polls, was declared legal in Egypt on Monday, state news agency MENA said, for the first time since the movement was founded eight decades ago.

"The commission on party affairs has given its approval for the formation of the Freedom and Justice Party," it said.

NATO air raids targeted the communications of Moammar Gadhafi's battered regime in Libya on Monday, hitting offices of the state broadcaster and his military intelligence headquarters, officials said.

The air strikes came ahead of a visit to Libya by an envoy from Russia, which has raised concerns about the scope of the military campaign.

Israeli Defense Minister Ehud Barak said on Monday that Syrian President Bashar Assad may be encouraging unrest on the Israel-Syria frontier in a futile effort to save his regime.

"We have no choice, we have to defend our border and Assad, in my opinion will fall in the end," said Barak a day after hundreds of protesters from Syria tried to cross into the Israeli-controlled Golan Heights.

Ruling conservatives in Iran kept up their criticism of President Mahmoud Ahamdinejad's inner circle on Monday, despite a plea for calm by all-powerful supreme leader Ayatollah Ali Khamenei.

In the latest broadside, Hojatoleslam Mojtaba Zolnour, Khamenei's deputy representative to the elite Revolutionary Guards, accused Ahmadinejad's entourage of seeking to weaken the foundations of the Islamic republic.

Snipers shot dead three supporters of powerful opposition tribal chief Sheikh Sadiq al-Ahmar in Yemen's capital on Monday, a tribal source said, blaming government troops.

"Three of Sheikh (Sadiq) Ahmar's supporters were shot dead by snipers stationed on rooftops near the tribal leader's home in al-Hassaba neighborhood" in north Sanaa, the source said.

U.N. chief Ban Ki-moon called Monday on all parties in the Arab-Israeli conflict to exercise "maximum restraint" and expressed "deep concern" about the shooting on the Golan Heights.

"The secretary-general regrets the loss of life, and extends his condolences to the families of the victims," said statement by Ban's spokesman.

Violence in Baghdad and central Iraq on Monday killed 16 people, including 12 struck by a car bomb driven by a suicide attacker in Saddam Hussein's home town of Tikrit, officials said.

The unrest came three days after attacks at a Tikrit mosque and hospital where victims were being treated killed 24, raising doubts over the capabilities of Iraqi security forces just months before all U.S. forces must pull out.