Lebanese Hezbollah leader Hassan Nasrallah vowed on September 19 to retaliate against Israel for explosions targeting pager devices in Lebanon, which he called an "unprecedented aggression" that killed and wounded numerous people.

In a televised speech, Nasrallah said the attack "will face a harsh accounting and just retribution, from where they expect and where they do not expect," Hezbollah media Al Manar reported. 

"What happened on Tuesday was that thousands of pager devices were targeted and detonated simultaneously by the Israeli enemy," Nasrallah said, adding that the explosions occurred "in hospitals, in pharmacies, in markets, in homes, in cars, on public roads where many civilians, women and children are present."

Nasrallah claimed the attack was intended to cause mass casualties. "When it detonated these devices, it deliberately intended to kill at least 4,000 people in one minute," he said, referring to Tuesday's incident.

The Hezbollah leader staunchly reaffirmed the group's support for Gaza, despite what he described as pressure to cease. "We say to Netanyahu and Gallant, Lebanon's front will not stop before the aggression on Gaza stops," Nasrallah declared.

He dismissed the effectiveness of Israeli threats, stating, "Netanyahu and Gallant and all the Zionist officials will not be able to return the settlers to occupied northern Palestine." Nasrallah warned that any attempt to establish a security zone in southern Lebanon would be met with fierce resistance.

"The idea of a security belt will not provide security for the settlers," he said. "Today, the resistance will not focus its operations only on the security belt but will expand operations in this belt and inside the occupied territories."

Nasrallah also thanked various entities for their support following the attacks, including Lebanese citizens, medical staff, and countries that offered assistance.

The speech comes amid escalating tensions between Hezbollah and Israel, with ongoing conflicts in Gaza adding to regional instability.