Six people were killed after a B-17 Flying Fortress bomber and a P-63 Kingcobra fighter plane crashed during a Dallas air show Saturday, officials said.
It is now believed the April 7 attack was carried out by the “deliberate placement of explosive charges” by one or more individuals at an ammunition holding area and shower facility on the base.
Military officials said there could have been more civilian casualties than initially thought in the raid that killed the top ISIS leader in Syria last week.