At least six people were killed when four bombers attacked a Lebanese village on the border with Syria early on Monday.
19 other were injured in the multiple attacks in the mostly Christian settlement of Qaa in eastern Lebanon.
Three Lebanese soldiers were among the wounded.
No one had claimed immediate responsibility for the attack which happened at about 4am local time (0100 GMT) on Monday.
But Hezbollah’s al-Manar television says the attack was carried out by Islamic State militants.
The mayor of Qaa, Bashir Matar, told reporters that those killed in the area were civilians.
Lebanon has been repeatedly jolted by militant attacks linked to the five-year-long war in neighbouring Syria.
Hezbollah leader, Sayyed Hassan Nasrallah, announced last Friday that the group plans to send more fighters to support Syrian government forces in and around Aleppo.