STORY: Widespread attacks on Hezbollah communication devices in Lebanon this week have turned the spotlight on Israel's secretive Unit 8200. On Tuesday, Hezbollah pagers detonated across the country simultaneously when a coded message was sent to them.

The absence of a full-blown war in Lebanon has been touted as a core U.S. achievement, but now Washington’s grip on the crisis appears more tenuous than ever.

Lebanon and Hezbollah have blamed Israel for the attacks on Tuesday and Wednesday that killed 37 people and wounded around 3,000, although Israel has not directly commented on the attacks, which security sources say were probably carried out by its Mossad spy agency.

Hezbollah admits Israel dealt a severe blow with exploding pagers and walkie talkies, but neither side seems to heed U.S. calls to avoid a wider war.

The leader of Hezbollah vowed to retaliate for this week’s deadly attacks on the group’s communications devices