A picture on two pages of "The Night Hamburg Died", Martin Caidin, Four Square/New English Library, London, 1966. Originally published in USA by Ballatine Books, Inc, 1960

The text under the picture reads:

A picture taken as the first teams entered the still-smoking "Dead Zone" of Hamburg. This illustrates vividly the terrible difficulties of the people in trying to evacuate the streets such as this one, while flames roared through the air with blast-furnace effect. Royal Air Force

(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.