A suicide bomber killed himself and three soldiers when he detonated a car bomb at a Lebanese army checkpoint in the border town of Arsal on Saturday, Lebanese security sources said.

Arsal is home to thousands of Syrian refugees but also Syrian rebels and their Lebanese allies who have fled a Syrian army advance on the Syrian side of the border. Three other soldiers were wounded, the sources said.

Lebanese Sunni militants accuse the Lebanese army of conspiring with forces loyal to President Bashar al-Assad and the Lebanese Shi’ite group Hezbollah, which has sent fighters into Syria to support Assad fight a Sunni-led revolt.