Iraq inspected an Iranian cargo plane bound for Syria on Monday, a day after it searched a Syrian aircraft flying from Moscow to Damascus, the head of Iraq's civil aviation authority said.

No prohibited items were found on either flight, Nasser Bandar told Agence France Presse.

Two more rockets fired from Syria landed on a border town in the Bekaa valley on Monday, prompting President Michel Suleiman to call for a security meeting which sought Arab League assistance in helping Lebanon confront the attacks.

“The safety of any Lebanese citizen is the sole responsibility of the Lebanese state … and any attack on Lebanon no matter from which side it came is rejected,” Caretaker Social Affairs Minister Wael Abou Faour said in a statement he read after the security meeting was held at Baabda palace.

A Syrian human rights group has said that a key military unit loyal to President Bashar Assad is running secret prisons holding hundreds of suspected regime opponents.

The Syria-based Violations Documentation Center said in a report Monday that the regime's 4th Division runs detention centers in its bases in and around Damascus.

Jordan's premier said the impact of the war in neighboring Syria is threatening the kingdom's security and that Amman will seek the United Nations Security Council's help in tackling the fallout.

"The Syrian crisis and its impact on Jordan are becoming a threat to national security," Prime Minister Abdullah Nsur told parliament in a policy statement late on Sunday, a transcript of which was released on Monday.

Main opposition group the Syrian National Coalition on Sunday expressed concern at jihadist al-Nusra Front's pledge of fealty to al-Qaida, warning it would serve the goals of President Bashar Assad's regime.

"The Syrian Coalition is deeply concerned about recent statements regarding the affiliations and ideologies of particular factions of the rebel forces," the group said.

Two people were killed and five others were wounded when rockets fired from Syria hit the Bekaa towns of al-Qasr and Hawsh al-Sayyed Ali in the Hermel District on Sunday.

“Ali Hasan Qataya was killed and four people were wounded, one critically, when shells fired from Syria hit the center of the Hermel town of al-Qasr,” said Lebanon's National News Agency.

A car bomb attack in Syria's northern city of Aleppo on Sunday killed two people and wounded 18, including three state television journalists, the channel reported.

Shadi Helw, the channel's Aleppo correspondent, and two cameramen, Yahya Moussali and Ahmed Suleiman, were among the wounded, the broadcaster said.

Syrian troops have broken a months-long rebel siege on two key military bases in the northwestern province of Idlib, killing at least 21 opposition fighters, a watchdog said on Sunday.

"Regime forces managed to lift the siege on the Wadi Deif and Hamdiya military camps after the army went around the rebel fighters and attacked them from behind," the Syrian Observatory for Human Rights reported.

President Bashar Assad's forces destroyed the minaret of the historic Omari mosque where Syria's uprising erupted two years ago in the southern city of Daraa, opposition activists said on Sunday.

In amateur video footage the activists uploaded to YouTube, the mosque can be seen at the end of a street, its towering minaret toppling over after apparent shelling and crumbling into rubble and dust.

Four Italian journalists who were being held hostage in Syria have been freed, Prime Minister Mario Monti said in a statement on Saturday.

The four -- three freelancers and a reporter working for the Italian public broadcaster RAI -- had been abducted sometime between April 5 and 6 while out filming in northern Syria.