A bomb blast killed at least nine people on Thursday outside a Muslim clerics' meeting in the Lebanese town of Arsal on the border with Syria, according to AFP and Reuters.
Six people were also wounded in the bombing outside the office of a local council of Muslim scholars, the source added.
Arsal is a Sunni Muslim enclave in mainly Shiite eastern Lebanon and hosts many Syrian refugees as well as rebel fighters in the surrounding countryside.
Militants linked to the conflict across the border in Syria have carried out attacks in and around Arsal in the past.
Emergency services were working to rescue people from the rubble, the National News Agency said.
Islamist groups including al Qaeda's Nusra Front have a presence in western Syria, including near the border with Lebanon, and there are have been several incursions by militants reported in the region.
