My dad John W Conway Jr. was the tail gunner on Beattys 8 Balls. On more than one occasion he told me that Urie Zook died in his arms of friendly fire while being transported by train to a different POW-camp. The ranking Officer in the rail car had the POW’s get on the roof of the car and spell out POW with their body’s . The lead aircraft saw the POW and pulled out and the rest of the fighters followed.