A German Air Force spokesman in Berlin has apparently stated that they believe the Learjet pilot was to blame for the collision - on the basis that the Typhoon was hit from below and lost a tank
I was the FA when we had a mid-air between a LU F4 and a Canberra when doing a VID.
Late break-away and a very hard pull later the F4 pilot felt a bump and thought he'd flown through the Canberra wake. The Canberra diverted with a Mayday and a ruptured wingtip tank.
Inspection on the ground showed witness marks on the
bottom of the F4 wing and horizontal tail and the missile rail pushed back 3-4 inches. The canberra wingtip tank had gone between the F4 missile rail and underwing tank scoring both. An either side or up and both would have been lost.
Lesson? Just because the damage was to the underside/tank of the Eurofighter doesn't, necessarily, make it the Learjet crews fault. Wait for the BOI result.