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:

Corpses found in shelters. Most likely carbon monoxide was the killer; the increasing heat afterwards blackened the bodies. (Below) Fleeing in a truck, these two men and a woman died of the direct effects of heat-even though no fire touched them or their vehicle. 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.