<p class="Component-root-0-2-46 p Component-p-0-2-37">Two historic military planes collided and crashed to the ground Saturday during an air show in Dallas, exploding into a ball of flames and sending plumes of black smoke billowing into the sky. It was unclear how many people were on board the aircraft or if anyone on the ground was hurt.</p> <p class="Component-root-0-2-46 p Component-p-0-2-37">Leah Block, a spokesperson for Commemorative Air Force, which produced the Veterans Day weekend show and owned the crashed aircraft, told ABC News she believed there were five crew members on the B-17 Flying Fortress bomber and one aboard the P-63 Kingcobra fighter plane. The Houston-based aircraft were not giving rides to paying customers at the time, she said.</p> <p class="Component-root-0-2-46 p Component-p-0-2-37">Emergency crews raced to the crash scene at the Dallas Executive Airport, about 10 miles (16 kilometers) from the city’s downtown. Live TV news footage from the scene showed people setting up orange cones around the crumpled wreckage of the bomber, which was in a grassy area.</p> <p class="Component-root-0-2-46 p Component-p-0-2-37">Anthony Montoya saw the two planes collide.</p> <p class="Component-root-0-2-46 p Component-p-0-2-37">“I just stood there. I was in complete shock and disbelief,” said Montoya, 27, who attended the air show with a friend. “Everybody around was gasping. Everybody was bursting into tears. Everybody was in shock.”</p> <p class="Component-root-0-2-46 p Component-p-0-2-37">Dallas Mayor Eric Johnson said the National Transportation Safety Board had taken control of the crash scene with local police and fire providing support.</p>