There were clashes overnight Thursday between supporters and opponents of Syrian President Bashar Assad, The Daily Star reported.
Lebanese commanders urged the public to assist its effort to bring calm.
"We call on residents living in areas that witnessed clashes in North Lebanon to cooperate with the army and report any suspicious activity," Army Command said in a statement Friday afternoon.
Sources among the Syrian groups told the Star anti-Assad forces have selected Husam Sabbagh, a fighter with alleged ties to al-Qaida, to head the fight against Assad loyalists in the Jabal Mohsen neighborhood, a loyalist stronghold. Lebanon has been seeking Sabbagh's arrest since 2007, when he was allegedly involved in violence in a Palestinian refugee camp.