An ammunition dump has exploded near the Syria-Lebanon border.
The explosion happened in a PFLP-GC base 30 miles east of Beirut, near the village of Qosaya.
The PFLP-GC is a leftist Palestinian refugee group. In May a PFLP-GC member fired a gun to warn off UN inspectors. No-one was hurt, and Lebanese officials apologised later, saying it was a misunderstanding.
Earlier this week Lebanon shot at smugglers near the Syrian border, and in the past month Syria shot smugglers on the Syrian side of the border.