A Lebanese security official says explosions in south of the country were caused by a blast in a Hezbollah weapons depot.
The blasts in the southern village of Tibnin came on the third anniversary of the month-long summer war between Israel and the militant group and triggered widespread panic among residents. The depot was housed in an abandoned building and was used during the 2006 war, added the official who spoke on condition of anonymity in line with military regulations.
There were no causalties in Tuesday's blast.
Andrea Tenenti, a spokesperson for UN peacekeepers in south Lebanon, said UNIFIL was investigating the incident. Hezbollah had no immediate comment.
Israel and Hezbollah fought a fierce but inconclusive month-long war in 2006.