Iran generally blames Israel for such attacks, but a group called Gonjeshke Darande claimed responsibility for a recent incident that shuttered a steel factory.
Security forces are blaming the explosion on a 'technical error,' which demolished an arms depot in the Hezbollah stronghold of Ain Qana in southern Lebanon.
'We share the pain of the Lebanese people and sincerely reach out to offer our aid at this difficult time,' Israeli President Reuven Rivlin commented after the deadly explosion.