NewsgalleryImages show aftermath of mid-air aircraft collisionThe fatal crash between a helicopter and light aircraft happened over Buckinghamshire on Friday (November 17)BookmarkShareNewsByIsabel DobinsonReporter16:12, 18 NOV 2017Updated16:34, 18 NOV 2017Debris at the crash site following mid-air collision (Image: UKNIP)1 of 9Debris at the crash site following mid-air collision (Image: UKNIP)2 of 9Investigators are at the scene (Image: UKNIP)3 of 9Police continue to investigate the cause of the crash (Image: UKNIP)4 of 9The tragic incident happened over Buckinghamshire on Friday (November 17) (Image: UKNIP)5 of 9Four people were killed in the collision (Image: UKNIP)6 of 9Locals reported hearing a large bang when the two aircraft collided (Image: UKNIP)7 of 9Two pilots and two passengers died in the collision (Image: UKNIP)8 of 9The investigation into the incident is ongoing (Image: UKNIP)9 of 9