A storm ensued on social media following the announcement of the pager attack, as footage showing injured men in the streets and moments of the explosions began circulating.
Hezbollah members were wounded in Beirut after their communication pagers exploded on Tuesday.
Lebanese health officials estimated up to around 4,000 wounded, with 200 in critical condition and 11 killed.
Lebanon's ex-central bank governor, Riad Salameh, was arrested in Beirut on financial crimes charges, including money-laundering and embezzlement.
Hezbollah reveals an advanced tunnel network, heightening tensions with Israel after a key commander’s assassination. The region braces for possible conflict.
Shortly after the American announcement, the British Embassy in Beirut also issued a statement advising against any travel to Lebanon.
Fuad Shukr's killing is the heaviest blow to Hezbollah's command since the 2008 assassination of Imad Mughniyeh, underlining the gravity of this week's escalation in the conflict.