An Arab delegation led by Qatar was headed for Damascus on Wednesday for mediation between the Syrian government and its opponents, even as activists rejected dialogue and called for a general strike.

"We will begin our meeting with Syrian officials in Damascus at around 3:00 pm (12:00 GMT) to inform them of the initiative, agreed upon by 21 foreign ministers," Arab League chief Nabil al-Arabi told Agence France Presse.

A truce between government and dissident forces collapsed as soon as it was announced, with at least 15 killed on Tuesday, as Yemeni President Ali Abdullah Saleh told the U.S. he is prepared to step down.

The State Department said Saleh told the U.S. ambassador in Sanaa that he is committed to a plan brokered by Gulf states that calls on him to quit 30 days after signing the deal in exchange for immunity from prosecution.

Tunisia's Islamist Ennahda party prepared for coalition talks Tuesday as early results showed it dominating the Arab Spring's first free elections.

Ennahda took 15 of the 39 seats from five domestic polling districts in the new constitution-writing assembly, the ISIE elections body announced, stressing the provisional nature of the tally.

The Turkish army Tuesday denied that tanks crossed into Iraq, in a statement posted on its website.

"Today there were some media reports about our tanks crossing to the other side of the border. These reports are not correct," the army said.

Former Libyan leader Moammar Gadhafi’s son and onetime heir apparent Seif al-Islam was on Tuesday poised to cross into Niger along with his father's ex-intelligence chief, a Tuareg official said.

The two are the top most wanted fugitives from the slain despot's ousted circle, who are wanted by the International Criminal Court and had been widely expected to seek refuge in Niger following Gadhafi’s death last week.

NATO reacted cautiously Tuesday to a request from Libya's new regime to maintain air operations a month longer than planned as the alliance indicated that consultations were still ongoing.

"NATO said it would closely consult with the U.N. and the NTC (National Transitional Council) before making a final decision," a NATO official said on condition of anonymity.

Seven security agents were killed in an attack on their road convoy in northwest Syria on Tuesday, apparently carried out by army deserters, a rights group said.

"Armed men, suspected deserters, attacked a security forces convoy at the entrance to Maaret al-Noman town in Idlib province, killing seven agents, including an officer," the Syrian Observatory for Human Rights said.

World leaders, including rival Iran's foreign minister, poured into Riyadh to offer condolences on the death of Saudi Crown Prince Sultan bin Abdul Aziz who was buried on Tuesday in the presence of an ailing King Abdullah.

While his successor has yet to be named, the body of Sultan, who died on Saturday in a New York hospital, has been repatriated to Riyadh for the funeral.

Iran's President Mahmoud Ahmadinejad on Tuesday urged the Libyan people to work together to prevent Western powers from taking control of their country and plundering its wealth.

"Their first objective is to take control of Libya and (then) attempt to impose non-revolutionary and non-popular rulers on its people," he said in a speech broadcast live on state television from South Khorasan province.

Jordan's opposition Islamists said on Tuesday the new government's line-up did not meet people's "aspirations and hopes" for reform, a day after the cabinet led by judge Awn Khasawneh took office.

"The new government's composition was not up to the inspirations and hopes of people," said Ali Abu Sukkar, head of the Islamic Action Front (IAF)'s shura council, in a statement carried by the group's website.