A police dog sniffs near news cameras outside  the entrance to the John Joseph Moakley United States Courthouse during the trial of  Dzhokhar Tsarnaev in relation to the 2013 Boston marathon bombings.  Photograph: Scott Eisen/Getty Images

A man who became one of the lasting images of the Boston Marathon bombing when he was wheeled away, ashen-faced, his legs severely injured, has told a(...)