Hezbollah war grows as the two sides trade new fire, Hezbollah's leader accuses Israel of crossing "red lines."

Israel's Mossad spy agency planted explosives inside 5,000 pagers imported by Lebanese group Hezbollah months before Tuesday's detonations, a senior Lebanese security source and another source told Reuters.

What strategic purpose did it serve? And what effect is it likely to have on the various conflicts in the region?