WI in Aug 1945, after the atom bombings of Hiroshima and Nagasaki, Jap prison guards in both Japan and other parts of Jap-held territory had systematically massacred as many Allied POWs still in their hands as possible ? OTL, there were a couple incidents where POWs were massacre around the time before VJ Day, including where 387 prisoners were buried alive in a mine near Aikawa, but WI such mass killings had been more systematic ? What would've been the reaction of the occupying American forces once they landed and were confronted with evidence of such atrocities ?