An emir of the Islamic State of Iraq and the Levant in the Syrian Qalamun was killed in an attack initiated by Hizbullah and the Syrian regime forces.

According to al-Akhbar newspaper published on Tuesday, Abou Abdullah al-Iraqi is reportedly responsible for training suicide bombers and preparing booby-trapped vehicles used in attacking several Lebanese areas.

Progressive Socialist Party chief Walid Jumblat renewed his call on rival Lebanese parties to unite to confront the danger of terrorists and salvage Lebanon.

Jumblat said that he agreed with Hizbullah Secretary General Sayyed Hassan Nasrallah during their meeting last month that the Islamic State's threat to the region puts Lebanon in danger.

Attacks on aid workers reached a new peak in 2013, with 155 relief staff killed, and danger levels remain high this year, according to figures released Tuesday.

Washington and Damascus are "not on the same page" in the fight against their common enemy the Islamic State, whose militants have declared a "caliphate" straddling swathes of Iraq and Syria, U.S. officials said Monday.

The U.S. aviation regulator Monday ordered airlines based in the United States to stop flying over Syria, citing a "serious potential threat" to civil planes, including armed groups with anti-aircraft weapons.

"Based on an updated assessment of the risk associated with such operations and the lack of any requests from operators wishing to fly in this airspace, we believe it prudent to prohibit US operators from flying into, out of and over Syria," the U.S. Federal Aviation Administration said in a statement.

Syrian warplanes bombed positions belonging to the jihadist Islamic State group in the northern province of Raqa for a second day on Monday, a monitoring group said.

On Sunday, regime planes killed 31 jihadists and eight civilians in an unprecedented wave of aerial bombardment against the group in its Raqa bastion.

A Yazidi refugee fleeing the jihadist offensive in Iraq has given birth to quintuplets in northeast Syria, an official with the U.N. refugee agency said on Monday.

"Tamam Ramadan had quintuplets on Thursday -- two boys and three girls -- after a caesarian section in hospital in Qamishli," the UNHCR official said, asking not to be identified by name.

The Syrian authorities and rebels agreed a truce Monday in the southern Damascus district of Qadam which was a battlefield for more than a year, state news agency SANA reported.

"A reconciliation agreement came into force on Monday," the agency reported Sheikh Jabr Issa, chairman of the reconciliation committee, as saying.

Progressive Socialist Party leader MP Walid Jumblat remarked on Monday the sectarian identity of Syria's Druze population will not protect it from strife, but its Arab and popular identity will.

He said in his weekly editorial in the PSP-affiliated al-Anbaa website: “The Druze should not fall for the Syrian regime's sectarian trap.”

Kurdish peshmerga fighters backed by federal forces and U.S. warplanes pressed a counter-offensive Monday against jihadists after retaking Iraq's largest dam, as the United States and Britain stepped up their military involvement.

The recapture of Mosul dam marks the biggest prize yet clawed back from Islamic State (IS) jihadists since they launched a major offensive in northern Iraq in June, sweeping Iraqi security forces aside.