At least 20 people were killed and more than 450 were wounded when walkie-talkies owned by Hezbollah members exploded across Lebanon yesterday, the second attack involving booby-trapped devices in two days, according to Lebanese and Hezbollah officials. The Israeli military has not commented on either attack, but 12 current and former officials said that Tuesday's attack, which used pagers, was years in the making. As part of a front company called B.A.C. Consulting, Israeli intelligence officers made pagers that contained batteries laced with the explosive PETN, which began shipping to Lebanon in the summer of 2022. This is how they built a modern-day Trojan horse.