While driving on a highway at approximately 5:00 p.m., a loud explosion occurred. My husband said it sounded like we were shot. Once we pulled over, we discovered the panoramic sunroof had exploded. We immediately pulled off on the nearest exit and drove the car right back to the dealer. While my husband drove the car, I researched sunroof explosions and found several complaints of other Kia cars with panoramic sunroofs that had exploded. Upon arrival at the dealership, the service department was closed, but we were able to bring the car inside the garage since it was raining. There was no impact to the sunroof and no bridge where something could have fallen from it. The broken glass looked like it had exploded outward like a volcano. Shattered pieces of glass were scattered on top of the cloth covering but most pieces must have flown off the roof during driving. A saleswoman made a ridiculous claim that the explosion could have been caused by hail. It was 55 degrees out. Another salesman made a comment that it could have been some kind of combustion or that something fell on top of the sunroof (like a meteorite fell from the sky while driving?). Now, the following morning, Kia (a man named Walt) is claiming something hit the sunroof, ‘pictures don’t lie’, and they will not do any work on the car until my insurance company is contacted and an appraiser comes to look at the damage. We also took pictures and do not see that an impact occurred. No other cars on the highway at the time the sunroof exploded were impacted with their driving or even pulled off the road, so I cannot imagine Kia’s claim that ‘something hit the sunroof.’ No other cars were impacted.