The port blast killed more than 200 people and injured thousands. The synchronized explosion of devices used by Hezbollah was widely believed to have been carried out by Israel.

For millions of Lebanese, this week’s mass explosion of pagers and walkie-talkies, with its bloody aftermath, is painfully similar to the horrific explosion four years ago of haphazardly stored ammonium nitrates that tore through Beirut’s port,

Bulgaria and Norway became new focal points on Thursday of a global hunt for who supplied Hezbollah with the thousands of pagers that exploded in Lebanon this week in a deadly blow to the militant group.

New explosions linked to electronic devices killed at least one person and injured at least 100, a day after pagers used by Hezbollah exploded, wounding thousands.

In Lebanon, exploding pagers and booby-trapped walkie-talkies – believed to be set off by Israel – have rattled Hezbollah and captured the world’s attention. What do they portend?

Walkie-talkies and pagers used by Lebanon's Hezbollah group detonated in homes and businesses across the country.