Prince Harry Attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

 Prime Minister David Cameron attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England

 Prince Harry is greeted by Dean of Westminster John Hall as he arrives at the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry is greeted by Dean of Westminster John Hall as he arrives at the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry arrives at the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry arrives at the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

 Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry leaves after a Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry leaves after a Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry leaves after a Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England. 

 Prince Harry leaves after a Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry leaves after a Service Of Commemoration For Tunisia Terrorist Attacks at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry departs after the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry departs after the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England

Prince Harry departs after the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry departs after the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry departs after the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prime Minister David Cameron attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry departs after the service of commemoration for the victims of the 2015 terrorist attacks In Tunisia at Westminster Abbey on April 12, 2016 in London, England.

 Sir Stephen Lamport (Receiver General of Westminster Abbey) and Prime Minister David Cameron attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

 Prince Harry lays a wreath as he attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prime Minister David Cameron looks on as Prince Harry lays a wreath before attending a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry lays a wreath as he attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England

Prime Minister David Cameron and Prince Harry attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Sir Stephen Lamport (Receiver General of Westminster Abbey) and Prime Minister David Cameron attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England

Prince Harry lays a wreath as he attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England

Prime Minister David Cameron and Prince Harry attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

 Prime Minister David Cameron attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

 Prime Minister David Cameron looks on as Prince Harry lays a wreath before attending a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

 Prime Minister David Cameron and Prince Harry attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Sir Stephen Lamport (Receiver General of Westminster Abbey) and Prime Minister David Cameron attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prime Minister David Cameron attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prince Harry attends a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Prime Minister David Cameron and Prince Harry attend a Service of Commemoration for victims of the 2015 Terrorist Attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

British Prime Minister David Cameron (R) speaks with Receiver General of Westminster Abbey Sir Stephen Lamport (L) as they wait for Britain's Prince Harry (not pictured) to arrive to lay a wreath at the Innocent Victims Memorial ahead of a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

British Prime Minister David Cameron leaves after a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

British Prime Minister David Cameron blows his nose as he waits to attend a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Britain's Prince Harry (L) shakes hands with British journalist Frank Gardner (2R) after a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England

Britain's Prince Harry listens during a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England. 

Britain's Prince Harry signs a hymn during a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.

Britain's Prince Harry addresses a service of commemoration for victims of the 2015 terrorist attacks in Tunisia at Westminster Abbey on April 12, 2016 in London, England.