Later in the war, the Allied bomber offensive sometimes took US or British bombers into Swiss airspace, either damaged craft seeking safe haven or even on occasions bombing Swiss cities by accident. Swiss aircraft would attempt to intercept individual aircraft and force them to land, interning the crews. Only one further Swiss pilot was killed during the war, shot down by a US fighter in September 1944. From September red and white neutrality bands were added to the wings of aircraft to stop accidental attacks on Swiss aircraft by Allied aircraft.