On 23 June 2014, a civil-operated Learjet 35 taking part in a German Air Force interception training exercise collided with the intercepting fighter aircraft as it began a follow-me manoeuvre. It became uncontrollable as a result of the damage sustained in the collision and crashed into terrain, killing both pilots. The Investigation found that whilst preparation for the exercise by all involved had been in compliance with requirements, these requirements had been inadequate, especially in respect of co-ordination between all the pilots involved, with both the civil and military safety regulatory authorities failing to detect and act on this situation.