An unsettling mystery has washed up on Japan's shores. <br /> <br />Over the past two months, at least 12 wooden boats have been found adrift or on the coast, carrying chilling cargo -- the decaying bodies of 22 people, police and Japan's coast guard said. <br /> <br />All the bodies were "partially skeletonized" -- two were found without heads -- and one boat contained six skulls, the coast guard said. The first boat was found in October, then a series of boats were found in November. <br /> <br />Coast guard officials are trying to unravel the riddle of where these ghostly boats came from and what happened to those on board. <br /> <br />Their best guess so far is that the ships are from North Korea.
