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The body of a Free Syrian Army fighter killed during heavy fighting against the forces of Syrian President Bashar al-Assad and Lebanon's Hezbollah is seen at the al-Barak area near Qusair town May 31, 2013. Image Credit: REUTERS

Beirut: Several fighters were killed in an overnight clash between Hezbollah fighters and Syrian rebel forces in Lebanon’s eastern border region with Syria, Lebanese security sources said on Sunday.

One source said 15 rebels were killed in the fighting east of the Bekaa Valley town of Baalbek, but the exact toll would not be clear until bodies could be retrieved from the remote and rugged border area. One Hezbollah fighter also died, he said.

Syria’s two-year-old conflict has increasingly sucked in its smaller neighbour, with deadly fighting shaking the northern Lebanese city of Tripoli and rockets hitting the Bekaa Valley and southern Beirut.

Guerrillas from Hezbollah, which supports the Iranian-backed President Bashar Al Assad, are fighting alongside his army to drive rebels from the Syrian border town of Qusayr, while Lebanese Sunni Muslim fighters have joined the anti-Al Assad revolt.

The latest fighting took place near Ain Al Jaouze in a finger of Lebanese territory which extends into Syria. The sources said the rebels may have been ambushed as they set up rockets to fire into Shiite areas of the Bekaa Valley. Rebels have said they will carry out attacks inside Lebanon in response to Hezbollah’s support for Al Assad’s assault on Qusayr, a strategic town for rebel weapons supplies and fighters coming into Syria from Lebanon.

The United Nations said on Saturday that up to 1,500 wounded people might be trapped inside Qusayr and warned all sides that they would be held accountable for the suffering of civilians.

But Security Council diplomats said Russia blocked a council declaration of alarm over the two-week siege of Qusayr, arguing that the council had done nothing when the town was first taken over by anti-Al Assad fighters.

The draft statement also urged forces loyal to Al Assad and rebels trying to oust him “to do their utmost to avoid civilian casualties and for the Syrian Government to exercise its responsibility to protect civilians”.

It appealed to Al Assad’s government “to allow immediate, full and unimpeded access to impartial humanitarian actors, including UN agencies, to reach civilians trapped in Al Qusayr”.

Moscow’s move to block the statement highlights the deep chasm between Russia and Western nations on how to deal with the war in Syria despite joint efforts by Washington and Moscow to convene a peace conference on Syria.

French Foreign Minister Laurent Fabius suggested on Sunday that the conference could take place in July. He said the Syrian government and the opposition must attend what he called “the last chance” for a negotiated solution.

“It’s not just about getting round the table and then asking what are we going to talk about. It needs to be prepared. That is why I say that the July date would be suitable,” Fabius said.

Al Assad has lost control of large areas of northern and eastern Syria but his forces have been fighting fierce counter-offensives in the south and centre of the country, including Damascus, Daraa and Qusayr.

The fighting has strengthened Al Assad’s hand ahead of the proposed peace talks, which the 47-year-old leader says he supports in principle. However he has dampened prospects of any transfer of his powers to a transitional government - a central element of efforts to secure a political solution. Al Assad’s opponents have also yet to commit to the peace talks.

The uprising against Al Assad, from the Alawite minority which is an offshoot of Shiite Islam, has killed at least 80,000 people, driven 1.5 million refugees across its borders and fuelled regional sectarian tensions.

Leading Sunni Muslim cleric Shaikh Yousuf Al Qaradawi, based in Qatar which has led regional pressure for Al Assad’s overthrow, called on Saturday for holy war against the Syrian government after intervention by Hezbollah, whose name in Arabic means the Party of God.