A number of people have been killed in an exchange of fire between Syrian rebels and fighters from the Lebanese militant group Hezbollah, say reports.
Lebanese security sources said the clashes took place on Lebanon's side of the border, near the town of Baalbek.
Hezbollah is fighting alongside the army in Syria, but the clashes have rarely crossed onto Lebanese soil.
Meanwhile the Red Cross has said it is alarmed by the worsening situation in the besieged Syrian town of Qusair.
It has appealed for access to the town, which lies just 10km (6 miles) over the Lebanese border.
Thousands of civilians are believed to be trapped as pro-government forces - including Hezbollah fighters - battle rebels.
The office of UN Secretary General Ban Ki-moon also appealed to the warring parties to allow residents to flee.
Syrian state TV quoted Foreign Minister Walid al-Moualem as saying the Red Cross would be allowed in "as soon as military operations are over".
Reuters reported that Mr Moualem had expressed his surprise to Mr Ban about the international concern, saying there had been none when rebels took over the town last year.
Also on Sunday, a car bomb killed nine members of the Syrian security forces in the capital, Damascus, according to the British-based pro-opposition watchdog the Syrian Observatory for Human Rights.
The watchdog said the bomb had targeted a police station in the eastern district of Jobar, which has seen renewed clashes between government forces and rebels who are entrenched there.
Qusair 'blockade'Reuters news agency quoted a Lebanese security source on Sunday as saying that at least 15 people were killed in the overnight fighting in Baalbek, just over the border from Syria. The casualties have not been independently verified.
Lebanese media quoted officials as saying the rebels had been preparing to launch rockets when the clashes broke out.
Syrian doctor describes the worsening humanitarian situation in Qusair
The Syrian rebels have threatened Hezbollah targets in Lebanon in revenge for its backing of the government in Damascus, and have frequently fired rockets into Lebanon, including several on Saturday.
Hezbollah fighters are also involved in the siege of Quasir, which is considered a key logistical hub and supply route for weapons smuggled into Syria.
An opposition activist told the BBC on Friday that around 30,000 civilians were still in the town, effectively under blockade.
The BBC's Imogen Foulkes in Geneva says the fact that both the UN and ICRC have issued urgent statements on Qusair at the same time is an indication of how desperate they believe the situation there has become.
Strategic town of Qusair
- Estimated population of 30,000 people
- Up to 10,000 people have fled to neighbouring towns and 1,500 people are wounded, the UN says
- Some 23 villages and 12 farms west of Qusair are reportedly inhabited by Lebanese Shia
- Near the main route from Damascus to port of Tartous, a gateway to the heartland of President Assad's Alawite sect
The UN Security Council attempted to issue a declaration voicing "grave concern" about Qusair, but it was blocked by Russia so failed to obtain the necessary unanimous agreement of council members.
A diplomat said Russia blocked the draft text because the UN had failed to speak out when Qusair was seized by rebels.
Fighting in Qusair intensified last month with militants from Hezbollah joining forces loyal to President Bashar al-Assad.
Reinforcements from the rebel Free Syrian Army are reported to have managed to break through from the north-east to support the embattled rebel fighters.
Some Lebanese Sunnis have also crossed into Syria to fight alongside the rebels, who are drawn largely from Syria's majority Sunni community.
Activists from the Syrian Observatory for Human Rights say rebels in Qusair are bracing themselves for another assault.
Fifteen Syrian army tanks have massed north of the town, says Rami Abdel Rahman, the observatory's director.
"Regime forces are reinforcing the sites that they have north of the city, including Dabaa airport and Jawadiya," he said.
The UN estimates that than 80,000 people have been killed and 1.5 million have fled Syria since the uprising against President Bashar al-Assad began in 2011.
02 Jun, 2013
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Source: http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNHuq-NPS9XNHuMf9rV0-xTfJirKFQ&url=http://www.bbc.co.uk/news/world-middle-east-22746675
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