AMMAN (Reuters) - At least one Hezbollah guerrilla and five Syrian rebels have been killed in fighting in Syrian territory on the border with Lebanon, nearby Lebanese residents and Syrian opposition sources said on Sunday.

Hadi al-Abdallah of the Syrian Revolution General Commission said fighting broke out on Saturday after Lebanese Hezbollah fighters, who are in control of eight Syrian border villages, tried to expand their sphere by moving into three adjacent villages that were in the hands of the rebel Syrian Free Army.

Hezbollah, one of Lebanon's strongest political factions, supports Syrian President Bashar al-Assad and says that dialogue between him and Syrian rebels will be the only way to defuse Syria's 23-month-old conflict.

(Reporting by Khaled Yacoub Oweis, Amman newsroom; Editing by Mark Heinrich)