What caused the death of:

Sgt Frederick L. ANDERSON - 743074 - missing believed killed on active service (Flight Global), commemorated on Panel 11 of the Runnymede Memorial, and

Sgt (Obs) William F.G. HOLLISTER - 561153 - 144 Sqn (Hampden, Hemswell, Lincolnshire) - died of wounds or injuries received in action (Flight Global), buried Sandown Shanklin (Shanklin) Cem., Isle of Wight (UK4986).

Regards and thanks for your help.
Henk.