Bekaa Deployment

Lebanon's army has deployed in the Bekaa Valley to try and contain the spillover from Syria:

The Lebanese army deployed into lawless areas of the northern Bekaa Valley over the weekend, shutting down unofficial checkpoints and pursuing car thieves and kidnappers as part of a broader national security plan to mitigate the damage being done by spillover from the civil war in neighboring Syria.

The security plan was devised by the newly-formed Lebanese government in response to the latest outbreak of fighting in Tripoli, Lebanon's second largest city, between the impoverished neighborhoods of Bab Tebbaneh and Jabal Mohsen whose Sunni and Alawite residents respectively support opposing sides in Syria. Two weeks of fighting in March killed at least 30 people...

On Sunday, Lebanese troops fanned out across the northern Bekaa Valley removing checkpoints manned by members of the militant Shiite Hezbollah. Hezbollah’s checkpoints were a security measure against Sunni suicide car bombers who have repeatedly struck Shiites areas of the northern Bekaa and the southern suburbs of Beirut since November.

OK, but here is part of the problem.  Lebanese don't have offer moral support to their favored Syrian sides, a number of them are actively taking part in the war, including most prominently Hezbollah itself.  As long as that is happening, nothing can guarantee Lebanon's own security.