When streams of bloodied people converged on Lebanon's hospitals on Tuesday, it was a test of whether the crisis-hit health sector could cope with a mass casualty event like what could be expected in a wider war with Israel.

A senior U.S. official has confirmed to Fox News that Israel is behind the explosions of pagers used by members of Hezbollah in Lebanon.

Israel and Lebanon came closer to all-out war on Thursday as the death toll rose to 37 from explosions involving a slew of Lebanese communication devices and Hezbollah's leader vowed retribution. About 3,