UN chief: Syria war threatens Lebanon's stability, with terror attacks and crush of refugees

The U.N. secretary-general is warning that the 3-year-old conflict in Syria poses a serious threat to the stability of neighboring Lebanon, as refugees stream into the small country and weapons and fighters are transferred out.

Ban Ki-moon's latest report to the U.N. Security Council, circulated Thursday, says the involvement of Lebanese groups in the Syrian fighting "has had a devastating impact on security," including several terrorist attacks in Lebanon "by groups claiming that they are acting in response to Hezbollah's fighting in Syria."

Sunni Muslims in Lebanon tend to support Syrian rebels. Lebanese Shiites tend to support the Syrian regime. The powerful Shiite Hezbollah group has sent fighters to support his forces.

Ban's report calls Lebanon "the smallest and most vulnerable of Syria's neighbors," but it hosts the most refugees.