A page from "The Night Hamburg Died", Martin Caidin, Four Square/New English Library, London, 1966. Originally published in USA by Ballatine Books, Inc, 1960

The text between the pictures reads:

Scene confronting rescue workers entering air raid shelter sometime after a raid. Victims succumbed to carbon monoxide. The blackening of the bodies is due to the effects of hot dry air after death, not to burns. Condition of man (below) was typical of dead found in streets. National Fire Protection Association

(Note that Caidin has worked for US "intelligence":

In Japan for two years with the Intelligence and Public Information offices of the U.S. 5th Air Force, Mr. Caidin toured the devastated Japanese cities, and spent much time in Hiroshima, where the world's first atomic bomb used in the war was dropped.