With Hezbollah and Lebanon still reeling from a coordinated wave of pager explosions on Tuesday that killed at least 12 people and injured thousands, another bombardment began on Wednesday, this time taking the form of exploding two-way radios. Footage of the explosions, which was not independently confirmed by WIRED, appears to show even larger blasts than those that emanated from the boobytraped pagers.

Lebanon’s official news agency also reported exploding home solar systems less than two hours after the radio detonations began on Wednesday, according to the Associated Press. Details of the alleged solar equipment attacks were still developing at the time of publication.

The walkie-talkie explosions appeared to have been orchestrated the same way as the attack on Tuesday, which was likely carried out by intercepting new pagers at some point in their journey through the supply chain and modifying them to add explosive material. Hezbollah had reportedly expanded its use of pagers recently in an attempt to secure communications after the group feared that other channels had been infiltrated by Israeli intelligence. Reuters reported on Wednesday that Hezbollah purchased the walkie talkies about five months ago as part of the same initiative that led the group to purchase the pagers.

In a statement after Wednesday’s explosions, Lebanon’s Health Ministry said more than 300 people had been injured and nine people had died, with incidents being reported in several regions of the country. The Lebanese Red Cross said more than 30 ambulances were involved in the treatment of people injured.

Though details of Wednesday’s attack are still emerging, the perpetrator of Tuesday’s exploding pager operation is widely believed to be Israel. Fighting between Israel and Hezbollah, which is backed by Iran, has intensified over the last year since Hamas’s October 7 attack on Israel. On Tuesday, Hezbollah blamed Israel for the “criminal aggression that targeted civilians too.”

“I’m floored by the sophistication of this operation,” says Jake Williams, vice president of research and development at Hunter Strategy who formerly worked for the US National Security Agency. “The scale of this supply chain compromise is unprecedented. It’s hard to imagine what technology Hezbollah could consider ‘safe’ at this point.”

Photos and videos posted to social media on Wednesday appeared to show handheld radios, or walkie-talkies, in various states of destruction. In many of the images, the devices, which are larger and bulkier than smartphones, had one side of their casing removed. Middle East experts citing local media reports noted that cars, scooters, and even buildings appear to have been damaged by tampered devices.

“From what we are seeing, including images circulating on social media, the devices exploding are handheld radios, possibly an Icom model,” says Michael Horowitz, head of intelligence at risk management company Le Beck International.

The second round of explosions on Wednesday indicates that whoever conducted the sabotage and attacks likely had deeply rooted access and knowledge of Hezbollah’s infrastructure and operations. “This shows an even deeper penetration that may have relied on multiple fronts and multiple vectors (different electronic devices and providers),” Horowitz says. “This is unheard of.”

The AP-900 runs on two AAA batteries, which, like any battery, could be induced to explode, but likely not with such force and scale as the explosions depicted in alleged videos of the blasts. If the pagers used by Hezbollah are the AR-924 or another model that runs on lithium-ion batteries, which can cause more dangerous explosions, it’s still unlikely that a regular pager battery alone could produce blasts that could injure multiple people.

“Those explosions aren’t just batteries,” says Jake Williams, vice president of research and development at Hunter Strategy who formerly worked for the US National Security Agency. “Based on the reporting, these pagers were likely interdicted by Israeli authorities and modified with explosives. This highlights the risks of supply chain security, especially in places where technology is harder to ship to.”

Gold Apollo did not immediately respond to WIRED’s request for comment.

Williams points out that such an operation would likely involve operatives on both the tech distribution side and the Hezbollah procurement side. “You compromise the supply chain, but you don’t want thousands of explosive pagers running around Lebanon,” he says. “The mole gets them to exactly the right people.”

Some reports on Tuesday indicate that Hezbollah recently expanded its use of pagers in an attempt to secure communications after other channels had been infiltrated by Israeli intelligence. The Associated Press reported that an anonymous “Hezbollah official” said the group had recently adopted a “new brand” of pagers that “first heated up, then exploded.”

“It’s unlikely that hacking was involved, as it’s likely that explosive material had to be inside the pagers to cause such an effect,” says Lukasz Olejnik, an independent consultant and visiting senior research fellow at King’s College London’s Department of War Studies. “Reports mention the delivery of new pagers recently, so perhaps the delivery was compromised.”

Michael Horowitz, head of intelligence at Middle East and North Africa risk management company Le Beck International, says if the attack is supply-chain-based, then it could have taken years to prepare and involved infiltrating a supplier and placing explosives inside new pagers.

“This is a major security breach, particularly if we’re talking about a charge that was placed inside the devices—which, in my opinion, is the most likely scenario,” Horowitz says. “This would mean that Israel has managed to infiltrate Hezbollah providers to the point of delivering hundreds (if not thousands) of devices used for secured communication.”

The incident comes amid escalations of fighting between Israel and Hezbollah in recent months, raising fears of a full-blown war. In the hours before the explosions on Tuesday, Israel said its war goals would include allowing 60,000 people to return to Northern Israel after they were evacuated following Hezbollah attacks, and it would not rule out military action.

Horowitz says the incident could be a “prelude to a broader offensive” and possibly meant to disrupt Hezbollah’s communications networks. It is likely that replacing a large number of pagers would take some time to organize. Alternatively, Horowitz says, the attack could also have been conducted to show the “scale of Israel’s intelligence penetration.”

“This is a high-value operation that you wouldn’t use just to cause injuries,” Horowitz says.

Even if the blasts were not caused by a cyber-physical attack that induced the pager batteries to explode, it’s still possible that explosives planted in the pagers were detonated using a remote command, possibly even a specially crafted pager message. Some footage appeared to show users checking their pagers right as the explosions occurred, though this could have been coincidental.

The operation could have a psychological impact on Hezbollah given that bombs may have been lurking undetected in such an unassuming device. And though Tuesday’s attacks were notably aggressive, it would not be the first time Israeli intelligence has reportedly planted explosives in electronics.

Updated at 3:25 pm ET, September 17, 2024: Added additional details about potential ways the attack could have been carried out.

Updated at 3:40 pm ET, September 17, 2024: Added additional details about the pager model that may have been used in the attack.

Updated at 5:20 pm ET, September 17, 2024: Updated to reflect the latest casualty figures.