On Tuesday, Lebanese security sources, speaking on condition of anonymity, said that dozens of insurgents entered the country through the Mashareeh al-Qaa area over the past two days, the Lebanese newspaper Daily Star reported.
Meanwhile, the Lebanese Army has beefed up its presence along the border with Syria.
Syria has been experiencing unrest since March 2011. Damascus says outlaws, saboteurs, and armed terrorists are the driving factor behind the unrest and deadly violence while the opposition accuses the security forces of being behind the killings.
Western states have been calling for Syrian President Bashar al-Assad to step down. However, Russia and China are strongly opposed to the Western drive to oust Assad.
The Syrian government says that the chaos is being orchestrated from outside the country, and there are reports that a very large number of the armed militants are foreign nationals, mostly from Egypt, Algeria, Saudi Arabia, and Afghanistan.