A day later, a similar attack struck walkie-talkies. In total, the explosions killed at least 37 people and injured more than 3,000, many of them civilians. Israel is widely believed to be behind the blasts, although it has neither confirmed nor denied responsibility.

U.N. peacekeepers in Lebanon urged immediate de-escalation as hostilities rumbled on at the Lebanese-Israeli border on Friday, following Israel's most intense airstrikes in nearly a year of conflict with the Iran-backed Hezbollah.

Officials in Lebanon reportedly have banned pagers and walkie-talkies from being brought onboard planes departing Beirut following explosions targeting Hezbollah.

The deadly Hezbollah-pager explosions are causing mounting distrust, with some Lebanon residents abandoning their electronic devices.