And yet the RAF targeted the German rescue aircraft which were painted white with red crosses (as per international regulations) and unarmed. It is a grey area of international law, not that the Nazi regime was a stickler for the law.
The reason given for attacking the the rescue aircraft was that they acted as spotters, reporting the position of British ships and convoys. This was and is vehemently denied by the Germans, but that's why they were attacked.
Cheers
Steve