The White House has warned all sides against escalation in the Middle East after two days of blasts in Lebanon, widely attributed to Israel, on hand-held devices targeting militant group Hezbollah.

"We still don't want to see an escalation of any kind. We don't believe that the way to solve where we're at in this crisis is by additional military operations at all," National Security Council spokesman John Kirby told reporters on Wednesday.

Turkey on Thursday accused Israel of seeking to expand the war in Gaza to Lebanon, terming as "alarming" a wave of deadly explosions that swept though Hezbollah strongholds.

"The escalation in the region is alarming," Foreign Minister Hakan Fidan said on state-run TRT television. "We see Israel mounting its attacks towards Lebanon step by step."

Japanese firm Icom said Thursday that it had stopped producing the model of radios reportedly used in recent blasts in Lebanon around 10 years ago.

"The IC-V82 is a handheld radio that was produced and exported, including to the Middle East, from 2004 to October 2014. It was discontinued about 10 years ago, and since then, it has not been shipped from our company," Icom said in a statement.

German Foreign Minister Annalena Baerbock on Thursday called for restraint in the Middle East after a second deadly wave of unprecedented device explosions at Hezbollah strongholds in Lebanon.

"I warn all sides against further escalation," Baerbock wrote on social media platform X. "Strikes and counterstrikes do not bring the region one millimeter closer to peace".

Hezbollah was in disarray on Thursday after a second wave of deadly explosions swept through its strongholds across Lebanon, putting pressure on its leader to exact revenge for the operation it blames on Israel.

The attack killed 37 people in two days, including two children, and wounded more than 2,931 others, according to Lebanese health ministry figures.

A preliminary investigation has found hundreds of pagers that exploded across Lebanon, killing at least 12 people and wounding up to 2,800, had been booby-trapped, a security source said Wednesday.

"Data indicates the devices were pre-programmed to detonate and contained explosive materials planted next to the battery," the official told AFP, requesting anonymity to discuss sensitive matters.

Nine people were killed and over 300 wounded Wednesday when walkie-talkies exploded across Lebanon, the government said, a day after pagers used by Hezbollah blew up, killing 12 and wounding up to 2,800.

The Iran-backed group blamed Israel for the first wave of blasts on Tuesday, vowing revenge and stoking fears of all-out war in the region.

Iranian President Masoud Pezeshkian said Wednesday that Western backers of Israel should feel "shame" after paging devices belonging to Lebanon's Hezbollah exploded, in a deadly attack the Tehran-aligned group blamed on Israel.

"Western countries and the Americans... fully support the crimes, killings and indiscriminate assassinations of the Zionist regime," Pezeshkian said in a statement, referring to Israel, adding that the explosions should bring them "shame."

U.S. Secretary of State Antony Blinken said Wednesday in Cairo that a ceasefire in the Israel-Hamas war in Gaza would be the best way to stop violence from spreading in the Middle East.

Lebanese medics treated Tuesday a stream of wounded people at a hospital car park as others in Hezbollah's southern Beirut stronghold rushed to give blood after group members' pagers had exploded.

Simultaneous blasts of the devices hit locations in several Hezbollah bastions across Lebanon, with the health ministry reporting 12 killed and some 2,800 others wounded.