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TOPSHOT - Britain's Queen Elizabeth II unveils a plaque at Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War. Mayflower Primary School now exists on the site of the Upper North Street School. / AFP PHOTO / POOL / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

TOPSHOT - Britain's Queen Elizabeth II unveils a plaque at Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War.
Mayflower Primary School now exists on the site of the Upper North Street School. / AFP PHOTO / POOL / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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Britain's Queen Elizabeth II waits to unveil a plaque at Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War. - Mayflower Primary School now exists on the site of the Upper North Street School. (Photo by Daniel LEAL-OLIVAS / POOL / AFP) (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Britain's Queen Elizabeth II waits to unveil a plaque at Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War. - Mayflower Primary School now exists on the site of the Upper North Street School. (Photo by Daniel LEAL-OLIVAS / POOL / AFP)        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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Britain's Queen Elizabeth II smiles as she walks past flag-waving school children after she tours Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War. Mayflower Primary School now exists on the site of the Upper North Street School. / AFP PHOTO / POOL / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Britain's Queen Elizabeth II smiles as she walks past flag-waving school children after she tours Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War.
Mayflower Primary School now exists on the site of the Upper North Street School. / AFP PHOTO / POOL / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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Britain's Queen Elizabeth II listens to a child reading a poem as she tours the classrooms at Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War. Mayflower Primary School now exists on the site of the Upper North Street School. / AFP PHOTO / POOL / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Britain's Queen Elizabeth II listens to a child reading a poem as she tours the classrooms at Mayflower Primary School during a visit to Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War.
Mayflower Primary School now exists on the site of the Upper North Street School. / AFP PHOTO / POOL / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

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Britain's Queen Elizabeth II arrives for a Memorial Service at All Saints Church, Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War. All Saints Church was where the funerals of 15 of the children who died in the bombing took place 100 years ago. / AFP PHOTO / POOL / Geoff PUGH (Photo credit should read GEOFF PUGH/AFP/Getty Images)

Britain's Queen Elizabeth II arrives for a Memorial Service at All Saints Church, Poplar in Tower Hamlets in East London on June 15, 2017, as part of commemorations to mark the centenary of the bombing of Upper North Street School during the First World War.
All Saints Church was where the funerals of 15 of the children who died in the bombing took place 100 years ago. / AFP PHOTO / POOL / Geoff PUGH        (Photo credit should read GEOFF PUGH/AFP/Getty Images)