Three attacks by German aircraft on Vichy merchant ships on 25 and 28 February and 1 March 1941:
http://warsailors.com/forum/read.php...2588#msg-62588
According to one of the entries, the German armistice commission admitted responsability of the first attack (that sank a cargo ship). The French then asked for two ships to be given to them in compensation, but the Germans answered they will have none while French ships won't scuttle when intercepted by British ships.