Numerous reports of unexploded bombs (UXB) were investigated during and shortly after WWII; in most cases the UXB were located and cleared by military bomb disposal teams. There were, however, instances where a device could not be found. In these instances, it was concluded the UXB had either travelled underground to a depth and position where it could not be reached, it had broken up on impact, leaving only fragments, or the report was mistaken and no UXB existed. It was decided that such UXB sites did not represent an immediate danger to the public, and they were added to the Abandoned Bomb Register. These sites would only be further investigated if new evidence arose or a device was unearthed. There are 26 possible UXB sites on the Abandoned Bomb Register for Wales; none of these is in Pembrokeshire.