Syrian tribes opposed to the embattled regime of Bashar al-Assad said Monday they would join forces in an "Assembly of Tribes," Syrian opposition members and media reported.

"Today we proclaim, as children of all tribes, an Assembly of Tribes," opposition Syrian National Council (SNC) member Mahmut al-Maslat said in a statement read out on behalf of the assembly.

Jobless protesters in an industrial suburb of Tunis threw petrol bombs and stones at police trying to break up their sit-in at a cargo handling company, the interior ministry said Monday.

The protest was sparked by the publication at the weekend of successful applicants for job openings at a stevedoring company near the port of Rades, 15 kilometers (nine miles) south of Tunis, the ministry said.

Tehran on Monday warned Arab states in the Gulf that things could become "very complicated" if they do not act cautiously over a simmering islands dispute between Iran and the United Arab Emirates.

Foreign Minister Ali Akbar Salehi made the declaration to Iran's ISNA news agency on the eve of talks in Doha between the Gulf Cooperation Council (GCC) states over three tiny islands in the Gulf and claimed by both Iran and the UAE.

Libyan leader Mustafa Abdel Jalil expressed confidence Monday that Algeria would not shelter anyone who poses a threat to his country, in a reference to Moammar Gadhafi’s family members who were granted asylum by Algiers.

"We appreciate the humanitarian position of Algeria for hosting the families, including women and children, but we are convinced that it would not shelter those who represent a threat for Libya's security," said Abdel Jalil after meeting Algeria's President Abdelaziz Bouteflika.

The Israeli army said Monday it has suspended an officer who hit a foreign activist in the face with his gun, in an attack that was condemned by Prime Minister Benjamin Netanyahu.

"Lieutenant Colonel Shalom Eisner has been suspended until the conclusion of the inquiry which has been opened," a military spokesman said.

More than 11,100 people have been killed in 13 months of unrest in Syria, including 55 since a U.N.-backed ceasefire took effect four days ago, a monitoring group said on Monday.

The death toll of 11,117 is 7,972 civilians and 3,145 military and gunmen, including fewer than 600 rebel fighters, the Syrian Observatory for Human Rights said.

United Nations chief Ban Ki-moon urged "maximum restraint" by the Syrian regime and cooperation from the opposition Monday as U.N. military observers began to monitor a fragile ceasefire.

"It is very important that the cessation of violence must continue," he said at a news conference in Brussels. "The Syrian authorities must exercise maximum restraint" and "the opposition forces should also fully cooperate."

A Syrian rights activist expressed alarm on Monday after 42 protesters among 500 people holding a candle-lit vigil last week outside parliament demanding an end to killings were arrested, some violently.

A group of youths carrying candles staged the sit-in on Thursday in front of the parliament building in Damascus, "demanding an end to the killings," said Anwar Bunni, who heads the Center for Legal Research and Studies.

Israel has barred nearly 80 foreigners from flying into the country on grounds they were linked to a pro-Palestinian campaign, police said on Monday, with 60 of them still awaiting deportation.

As of midnight, police at Ben Gurion airport near Tel Aviv had detained 78 people, more than two-thirds of them French nationals, spokeswoman Luba Samri said.

Syrian forces were locked in fierce gunfights Monday with rebels in one city and shelled another, as the U.N. chief urged "maximum restraint" after the arrival of observers to oversee a truce aimed at ending 13 months of bloodshed.

President Bashar al-Assad's forces killed at least 45 civilians and were fighting rebels at Idlib in the northwest, while also shelling the flashpoint central city of Homs, said the Local Coordination Committees and the Syrian Observatory for Human Rights.