WARNING: the following story includes disturbing content.⁠ ⁠ Authorities now know what happened on the Eisenhower Expressway last Thursday, leading to a bomb squad response and shutting down the interstate for hours.⁠ ⁠ It was a commercial-grade firework mortar that went off inside the SUV being driven by 47-year-old Jorge Vaca from west suburban Cicero.⁠ ⁠ A senior law enforcement official with direct knowledge of the case told NBC Chicago the fireworks rocket was ignited inside Vaca's vehicle and shot into his chest.⁠ ⁠ It wasn't a bomb, and nobody did it to him, they said. The question is, still, why did it happen?⁠ ⁠ Vaca was killed when the firework shot into his chest as he was driving across the expressway, according to the law enforcement official, backed up, he said, by the autopsy report that is yet to be released. The blast blew out windows in Vaca's SUV, which came to a stop on the highway. No one else was hurt.⁠ ⁠ Tap the 🔗 in our bio to learn more.⁠ ⁠ #fireworks #chicago...