Six people died when two military planes from World War II collided mid-air during an air show in Dallas on Saturday.

“According to our Dallas County Medical Examiner, there are a total of 6 fatalities from yesterday’s Wings over Dallas air show incident,” Dallas County Judge Clay Jenkins tweeted Sunday.

“Authorities will continue working today on the investigation & identification of the deceased. Please pray for their families and all involved,” he added.

Three of the victims were identified Sunday. Two were former Allied Pilots Association members and another was a member of the Ohio Wing Civil Air Patrol.

“We are saddened to report that former APA members CA Terry Barker and CA Len Root were among the crewmembers lost on B-17 Flying Fortress during the Wings Over Dallas airshow today. Our hearts go out to their families, friends, and colleagues past and present,” Allied Pilots said in a tweet.

Maj. Curtis J. Rowe, a 30-year veteran of the Ohio Wing Civil Air Patrol, also died in the devastating accident.

“To a great aviator, colleague, and Auxiliary Airman, farewell,” Col. Pete Bowden, the agency’s commander, wrote in a Facebook post.

The tragic crash took place Saturday afternoon when a Boeing B-17 Flying Fortress and a Bell P-63 Kingcobra collided during a Wings Over Dallas air show event at Dallas Executive Airport.

The FAA said it was unknown how many people were on both aircrafts during the crash. However, a spokesperson for the Commemorative Air Force told ABC News there were believed to be five crew members on the B-17 and one on the single-seat P-63.

Video posted to Twitter shows a B-17 colliding with a smaller plane sending debris flying and then fireballs as both quickly fell to the ground.

A woman watching the planes from a shopping center parking lot can be heard on another video saying “Oh no. Oh no” as they collide and then “Oh my God!” as she sees the fireball.

An announcer can be heard in one video telling spectators of the air show to stay off their cell phones to keep channels clear for emergency responders and that children “may wish to turn away” from the scene.

Dallas Mayor Eric Johnson tweeted “As many of you have now seen, we have had a terrible tragedy in our city today during an airshow. Many details remain unknown or unconfirmed at this time. The @NTSB has taken command of the crash scene with @DallasPD and @DallasFireRes_q continuing to provide support.”

He added: “The videos are heartbreaking. Please, say a prayer for the souls who took to the sky to entertain and educate our families today.”