Syria denounced Thursday U.S. sanctions imposed on President Bashar al-Assad and top aides, saying they were part of long-time efforts by Washington to impose its will in the region to Israel's benefit.

The Syrian Revolution 2011, a Facebook group spurring anti-regime protests, meanwhile called for fresh demonstrations on Friday for "liberty and national unity."

A special security court in Bahrain has sentenced nine people to 20 years in prison each after it convicted them of abducting a policeman, state news agency BNA reported Thursday.

"The Lower National Safety Court sentenced nine defendants accused of kidnapping one policeman to 20 years in prison," according to an English-language statement on BNA that did not give further details.

A spate of bomb attacks against police in the disputed northern oil-rich city of Kirkuk on Thursday killed at least 27 people, the worst violence to hit Iraq in nearly two months.

A further 89 people were wounded in the three attacks; with just months to go before U.S. forces must withdraw from the country.

Al-Qaida has released a message from slain leader Osama bin Laden praising the revolutions in Egypt and Tunisia and urging Muslims to take advantage of a "rare historic opportunity" to rise up, U.S. monitors said.

The message posted on jihadist forums on Wednesday by al-Qaida's media arm As-Sahab addresses Muslims on the revolutions sweeping the Middle East and North Africa, SITE Intelligence said.

U.N. chief Ban Ki-moon on Wednesday urged Israel to be more flexible in dealings with the Palestinian leadership and offer "incentives" to get deadlocked talks started again.

Ban told Agence France Presse in an interview that he was also pressing Palestinians to get Hamas to recognize Israel and renounce violence. But the new Hamas-Fatah unity must be given a chance, Ban said.

U.S. President Barack Obama on Wednesday sanctioned Syrian President Bashar al-Assad and six top aides over their crackdown on popular protests, telling Assad to launch a transition to democracy or step down.

Obama signed the executive order to "increase pressure on the government of Syria to end its use of violence and begin transitioning to a democratic system that ensures the universal rights of the Syrian people," the document said.

Kuwait and Iran have agreed to return their ambassadors, Iran's Foreign Minister Ali Akbar Salehi said Wednesday, signaling an end to tensions that have soured ties between both countries.

"It has been decided for the ambassadors of both countries to quickly return to their missions," Salehi told reporters in Kuwait.

Syria's embattled President Bashar al-Assad has said he believes the unrest roiling his country is coming to an end while acknowledging that security services had made mistakes in trying to tame a two-month revolt.

The international community, meanwhile, appeared divided Wednesday on how to tackle the Syrian crisis. Switzerland joined an EU-led sanctions regime, while Russia warned it would oppose any proposed U.N. resolution to intervene with force in Syria.

Suspected Libyan al-Qaida militants exchanged fire with security forces in Tunisia Wednesday, leaving two alleged militants and a Tunisian colonel dead, security officials and the government said.

The suspected militants were wearing belts of explosives and were "terrorists, strongly suspected of belonging to the al-Qaida network," a Tunisian security official said.

Yemen's political rivals have agreed to sign a Gulf-brokered plan Wednesday to end the country's bloody political crisis, the president's aid told al-Arabiya television, but the opposition was cautious.

When asked if the agreement would be signed Wednesday, President Ali Abdullah Saleh's aide Ahmed al-Sufi said: "Yes, it will be today." There has been "positive" and "important progress."