Britain's new Defense Secretary Philip Hammond said Sunday that the reputation of Libya's new leaders had been "stained" by the killing of ousted dictator Moammar Gadhafi.

Hammond said he would like to see an investigation into the death of Gadhafi, who was captured alive during the fall of his hometown Sirte on Thursday.

Israel must set new rules governing prisoner exchanges such as the one implemented to secure soldier Gilad Shalit's release, Israel's defense minister Ehud Barak said on Sunday.

"I'm happy about the deal on the exchange for Gilad Shalit, but we must set new rules," he told the free daily newspaper Israel Hayom.

Polls opened at 07:00 am (0600 GMT) Sunday in Tunisia's first-ever free elections, nine months after the surprise toppling of strongman Zine el Abidine Ben Ali in a popular revolt, Agence France Presse reporters witnessed.

Some 7.2 million people are eligible to elect a 217-member assembly that will write a new constitution after decades of autocratic government under Ben Ali, whose ousting sparked the Arab Spring.

Syria's military clampdown on protest hubs, and skirmishes pitting soldiers against armed gunmen, believed to be defectors, killed at least 11 people dead on Saturday, activists said.

Meanwhile, Iran, Syria's key ally, took a tougher stance against the regime of President Bashar Assad, openly condemning its crackdown on dissent that has left more than 3,000 people dead, most of them civilians, according to the United Nations.

Jordan's powerful Islamist opposition said on Saturday it would not join the reform-mandated government of prime minister-designate Awn Khasawneh, a decision reflecting its "pessimism."

"The executive offices of the Muslim Brotherhood and the Islamic Action Front (IAF) decided, after a joint meeting, to refuse to participate in the government," read a statement on the Brotherhood's website.

U.S. President Barack Obama offered condolences to Saudi Arabia on Saturday after the death of Crown Prince Sultan bin Abdul Aziz, calling him a "valued friend" who helped cement ties between the allies.

"He was a strong supporter of the deep and enduring partnership between our two countries forged almost seven decades ago," Obama said in a statement, adding that he learned of the crown prince's death with "great regret."

Palestinian president Mahmoud Abbas said he would push for statehood at the United Nations even if he resumes peace negotiations with Israel, Egyptian state media reported on Saturday.

Abbas, who was in Cairo for meetings with Egypt's leadership, said he would "immediately" resume talks with Israel if it accepted a Middle East Quartet statement from last month, MENA said.

An Egyptian court sentenced a man to three years in jail with hard labor on Saturday for insulting Islam in postings on Facebook, the official MENA news agency reported.

The Cairo court found that Ayman Yusef Mansour "intentionally insulted the dignity of the Islamic religion and attacked it with insults and ridicule on Facebook," the agency reported.

Saudi Arabia, ever keen to preserve its stability, is likely to act quickly and appoint Prince Nayef bin Abdul Aziz, the obvious choice, as the new heir of the thrown, analysts said.

"There is only one candidate who has all the possibilities of becoming crown prince: Prince Nayef," the interior minister and King Abdullah's half-brother, Abdul Aziz al-Sager, chairman of the Gulf Research Centre, told Agence France Presse.

Egyptian election officials said on Saturday they have extended the registration deadline for candidates in upcoming parliamentary polls by two days following requests from several political parties.

Candidates began submitting their applications on October 12 and the doors were to close on Saturday, after a first extension.