Enemy planes sinking neutrals?
 

My base was attacked, yet again (though this time I shot out of the pen at flank speed and dived). Anyway, I noticed that as well as sinking four German ships there's a wee grey one;

http://img153.imageshack.us/img153/8...ral10iu.th.jpg

Later I was being harassed by aircraft while trying to sink a ship. Again some grey sunken ship icons appeared, right in the path the aircraft were taking;

http://img208.imageshack.us/img208/8...ral26kd.th.jpg

Am I right in saying that the grey mark on the map indicates a neutral? If so then why are the Allies sinking them? :doh:

Btw the weather was sunny, clear and fine. So they weren't going down due to high seas.