A day after a massive pager explosion in Lebanon, thousands of personal radios and walkie-talkies used by Hezbollah members exploded on Wednesday. 

According to Lebanon's Health Ministry, at least 9 people were killed and 300 were injured by second wave of device explosions. 

A source close to Hezbollah said walkie-talkies used by its members blew up in its Beirut stronghold, with state media reporting similar blasts in south and east Lebanon.

Experts say these coordinated attacks represent a crucial phase in Israel's ongoing efforts to disrupt Hezbollah's communication networks.

Multiple explosions occurred Wednesday at the site of a funeral for three Hezbollah members and a child killed by exploding pagers the day before, according to Associated Press journalists at the scene.

Hezbollah’s Al Manar TV reported explosions in multiple areas of Lebanon, which it said were the result of walkie-talkies detonating.

Pagers used by the militant group exploded nearly simultaneously a day earlier in Lebanon and Syria, killing at least 12 people, including two children, and wounding around 2,800. Hezbollah and the Lebanese government blamed Israel.

An American official said Israel briefed the United States after the attack, in which small amounts of explosive hidden in pagers were detonated. The person spoke on the condition of anonymity because they were not authorized to discuss the information publicly.

The sophisticated attack renewed fears that the Israel-Hamas war in Gaza could spill into a wider regional conflict. Secretary of State Antony Blinken said Wednesday the U.S. is still assessing how the attack could affect efforts to negotiate a Gaza cease-fire.

Hezbollah and Israeli forces have exchanged fire almost daily since Oct. 8, the day after a deadly Hamas-led assault in southern Israel triggered the war. Since then, hundreds have been killed in the strikes in Lebanon and dozens in Israel, while tens of thousands on each side of the border have been displaced. Hamas and Hezbollah are allies and both are supported by Iran.