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In the latest in a series of recent incidents that threaten to involve Lebanon in the civil war next door, two rockets fired from Syria landed Tuesday in and near the Lebanese city of Hermel, CNN reported, citing Lebanon's state news agency NNA. 

No one was hurt in the city, which is a Hezbollah stronghold.

It was not immediately known who fired the rockets. Hezbollah, the militant Shiite movement, has been backing the Syrian government in its fight against anti-government rebels.

Earlier Tuesday, three Lebanese soldiers were killed when unknown armed men opened fire at a military checkpoint near Lebanon's border with Syria, according to NNA.

The attack, in the eastern border town of Arsal, was branded a "heinous crime" by former Lebanese Prime Minister Saad Hariri.

"It requires all political groups to be vigilant and wise, to enable the army to accomplish its mission of protecting this peace, and to keep away from ongoing operations aiming to drag Lebanon into the fighting inside Syria, which will fuel incitement and turn the State and its military and security institutions into a false witness of policies that are not in the national interest," Hariri said in a statement published by NNA.

Arsal is known for its links to Lebanese Sunni rebel sympathizers; some of its residents are believed to be fighting under the banner of the radical group al-Nusra Front.