other, crashing mid-air during an air show in Texas, killing at least two people.

A video clip showed the two planes colliding at a low altitude, which led to one of them splitting in half with what looked like a fireball hitting the ground.

The two planes - one of them a Boeing B-17 Flying Fortress - were taking part in a memorial air show near Dallas.

The number of people on board the planes was unknown at the time of the accident. But the US Civilian Pilots Association said its former members Terry Parker and Lyn Root were among those killed in the crashOther reports published by local media suggest that about six people were killed in the collision