Hezbollah thought it had switched to a safer method of communication, fearing mobile phones could be hacked by Israel.
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Instead it was humiliated after hundreds of the group's new pagers exploded, causing chaos and panic across Lebanon.
Eight dead and thousands injured, among them Iran's ambassador in Beirut.
Could this be the trigger that sparks the long-feared wider war in the region?
Warning, this report contains scenes of injured people.
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