Five Syrian shells landed near a northeastern Lebanese border town near Syria's Homs on Wednesday, but no casualties were reported, China's Xinhua said, citing Lebanon's state-run National News Agency.
The incident comes a day after Lebanese President Michel Suleiman warned that any border infraction from neighboring war-torn Syria would amount to a violation of sovereignty, according to Reuters.
Local reports said the missiles landed outside Lebanon's al-Qasr, a border area not far from the volatile Syrian province of Homs, according to Xinhua.
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Hezbollah's al-Manar television said the mortars were launched from areas with active "armed Syrian groups," a term widely seen as a reference to the rebels fighting Syrian President Bashar al-Assad, reported Reuters.
The conflict in Syria, which began as a peaceful uprising against the president but quickly turned violent, recently entered its second year. The United Nations estimates that some 70,000 people have died, while hundreds of thousands have fled the country.
International efforts to help end the crisis there have not been successful.