This morning the panoramic sunroof on our 2012 Kia Sorrento spontaneously exploded. Shattered and chunks of safety glass came down on us. My son and I sustained superficial injuries (I sustained laceration over left eye and on left hand) - he has a lump on the right side of his skull. When we pulled over the glass was also on the rear portion of the roof. Nothing struck the vehicle. There was no vehicle/truck in front of us for potential debris. Open sky above. It sounded like a gunshot before the glass exploded over us.