An explosive new report has shed new light on Israel’s involvement in the recent attacks on Hezbollah operatives using explosive-laden pagers.

According to ABC News, citing a US intelligence source, the plot involved shell companies and multiple layers of Israeli intelligence officers and their assets that produced the explosive pagers. This type of “supply chain interdiction” operation has been in the planning for at least 15 years and is a tactic the CIA has long been reluctant to employ because the risk to innocents is deemed too high.

Triggered remotely by one to two ounces of explosives and a remote trigger switch planted in the pagers, the explosions that rocked Hezbollah over the past two days have killed at least 37 and wounded 2,931, according to Lebanese Health Minister Firass Al-Abyad.

As a result, tensions between Hezbollah and Israel have escalated dramatically. In a televised speech on Thursday, Hezbollah leader Hassan Nasrallah claimed the group’s top leadership had old pagers and were not affected by the new ones used in the attack. He also warned that Israel will nonetheless pay for its act of aggression.

“We undoubtedly suffered a major security and humanitarian blow, unprecedented in the history of man and maybe in the history of the conflict. We were hit hard, but that’s the situation in war,” Nasrallah admitted. “We understand that the enemy has technological supremacy, especially since it is supported by the US and the West. When we are in conflict, we bet on Jihad, on attrition. We had many victories until now.”

“The heavy blow that we suffered won’t knock us down. From experience, we will become stronger, smarter, and more determined. We will be ready to overcome all of the threats and attempts in the future,” he said. “Israel crossed all the red lines by detonating thousands of pagers. This could be called a declaration of war.”