(01 of16)
Open Image ModalMayor of London Boris Johnson in talks with New York Mayor with Bill de Blasio at City Hall in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(02 of16)
Open Image ModalMayor of London Boris Johnson in talks with New York Mayor with Bill de Blasio at City Hall in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(03 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(04 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(05 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(06 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(07 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(08 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(09 of16)
Open Image ModalMayor of London Boris Johnson meets Firemen from FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(10 of16)
Open Image ModalMayor of London Boris Johnson talks with Board President of the September 11th Familiesâ Association and co-founder of 9/11 Tribute Center, Lee Ielpi, whose firefighter son Jonathan died in the terrorist attack, as they arrive at FDNY Ten House close to the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(11 of16)
Open Image ModalMayor of London Boris Johnson lays flowers at the 9/11 Memorial at the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(12 of16)
Open Image ModalMayor of London Boris Johnson at the 9/11 Memorial at the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(13 of16)
Open Image ModalMayor of London Boris Johnson talks with Board President of the September 11th Families' Association and co-founder of 9/11 Tribute Center, Lee Ielpi, whose firefighter son Jonathan died in the terrorist attack, at the 9/11 Memorial at the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(14 of16)
Open Image ModalMayor of London Boris Johnson at the 9/11 Memorial at the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(15 of16)
Open Image ModalMayor of London Boris Johnson lays flowers at the 9/11 Memorial at the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)
(16 of16)
Open Image ModalMayor of London Boris Johnson talks with Board President of the September 11th Familiesâ Association and co-founder of 9/11 Tribute Center, Lee Ielpi, whose firefighter son Jonathan died in the terrorist attack, at the 9/11 Memorial at the World Trade Center site in New York, on the sixth day of his week long trade visit to the United States taking in Boston, New York and Washington. (credit:Stefan Rousseau/PA Wire)