London  - Two female teenage air cadets and two Royal Air Force (RAF) instructors were killed in a mid-air collision of two RAF training aircraft in Britain Wednesday.

The two light aircraft crashed over sand dunes in a nature reserve in south Wales, in the south-west of Britain, police said.

The two girls, of school age, were taking part as air training corps cadets in a half-hour flying experience offered by the RAF.

An RAF spokesman confirmed that two members of the RAF and two Air Training Corps cadets had "tragically died" in the crash.

A full investigation was launched into the accident. (dpa)