Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view of jockys during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Scott Heppell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 Jockeys Nico de Boinville and Daryl Jacob during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Peter Powell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 Jockey Billy Garritty during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Peter Powell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 Jockey Bridget Andrews during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Peter Powell

A general view during the two-day party congress of the far-right Alternative for Germany (AFD) amid the coronavirus disease (COVID-19) pandemic in Dresden, Germany, April 10, 2021. REUTERS/Matthias Rietschel

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Yui Mok/Pool via REUTERS

Members of a local electoral commission, wearing protective suits amid the coronavirus disease (COVID-19) outbreak, visit a voter during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

Members of a local electoral commission, wearing protective suits amid the coronavirus disease (COVID-19) outbreak, walk with mobile ballot boxes during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 Jockey Rachael Blackmore during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Peter Powell

A local resident casts a ballot into a mobile ballot box during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

A local resident studies her ballot during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

A local resident signs a form during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

A local resident signs a form next to members of a local electoral commission, wearing protective suits amid the coronavirus disease (COVID-19) outbreak, during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

A local resident casts a ballot into a mobile ballot box next to a membes of a local electoral commission, wearing protective suits amid the coronavirus disease (COVID-19) outbreak, during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

Members of a local electoral commission, wearing protective suits amid the coronavirus disease (COVID-19) outbreak, walk with mobile ballot boxes during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

A local resident casts a ballot into a mobile ballot box during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

A local resident signs a form during early voting in constitutional referendum in the village of Koy-Tash near Bishkek, Kyrgyzstan April 10, 2021. REUTERS/Vladimir Pirogov

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 Spectators look on during the EFT Systems Handicap Hurdle Pool via REUTERS/Scott Heppell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view during the EFT Systems Handicap Hurdle Pool via REUTERS/Peter Powell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view during the EFT Systems Handicap Hurdle Pool via REUTERS/Peter Powell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view during the EFT Systems Handicap Hurdle Pool via REUTERS/Peter Powell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view during the EFT Systems Handicap Hurdle Pool via REUTERS/Peter Powell

Members of the public watch as a gun salute is fired by The King's Troop Royal Horse Artillery to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Yui Mok/Pool via REUTERS

Demonstrators scuffle with police officers during a protest against the coronavirus disease (COVID-19) measures in Vienna, Austria, April 10, 2021. REUTERS/Lisi Niesner

Demonstrators scuffle with police officers during a protest against the coronavirus disease (COVID-19) measures in Vienna, Austria, April 10, 2021. REUTERS/Lisi Niesner

Police officers detain a demonstrator during a protest against the coronavirus disease (COVID-19) measures in Vienna, Austria, April 10, 2021. REUTERS/Lisi Niesner

Members of the public watch as a gun salute is fired by The King's Troop Royal Horse Artillery to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Yui Mok/Pool via REUTERS

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view of jockys during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Scott Heppell

Horse Racing - Grand National Festival - Aintree Racecourse, Liverpool, Britain - April 10, 2021 General view of jockys during a two minute silence after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99 Pool via REUTERS/Scott Heppell

AFD party member Alexander Gauland attends a two-day party congress of the far-right Alternative for Germany (AFD) amid the coronavirus disease (COVID-19) pandemic in Dresden, Germany, April 10, 2021. REUTERS/Matthias Rietschel

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

AFD party member Alexander Gauland attends a two-day party congress of the far-right Alternative for Germany (AFD) amid the coronavirus disease (COVID-19) pandemic in Dresden, Germany, April 10, 2021. REUTERS/Matthias Rietschel

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery stand by as a gun salute is fired to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

A member of The King's Troop Royal Horse Artillery prepares empty shells to be used during a gun salute to commemorate the death of Britain's Prince Philip, Duke of Edinburgh, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

A member of The King's Troop Royal Horse Artillery prepares empty shells to be used during a gun salute to commemorate the death of Britain's Prince Philip, Duke of Edinburgh, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

A girl holds a letter in front of flowers at Hillsborough Castle after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Hillsborough, Northern Ireland, April 10, 2021. REUTERS/Jason Cairnduff

A man brings flowers to Hillsborough Castle after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Hillsborough, Northern Ireland, April 10, 2021. REUTERS/Jason Cairnduff

People bring flowers to Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 10, 2021. REUTERS/Henry Nicholls

Children holding flowers stand outside Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 10, 2021. REUTERS/Henry Nicholls

Children holding flowers stand outside Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 10, 2021. REUTERS/Henry Nicholls

A man bows in front of flowers placed at Hillsborough Castle after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Hillsborough, Northern Ireland, April 10, 2021. REUTERS/Jason Cairnduff

Members of The King's Troop Royal Horse Artillery attend a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Daniel Leal-Olivas/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

General practitioner Kerem Erekul fills in the vaccination certificate after a man received a dose of the AstraZeneca coronavirus disease (COVID-19) vaccine in a doctor's practice in Berlin, Germany, April 10, 2021. REUTERS/Fabrizio Bensch

Rugby Union - European Challenge Cup Quarter Final - Leicester Tigers v Newcastle Falcons - Welford Road Stadium, Leicester, Britain - April 10, 2021 Newcastle Falcons' George Wacokecoke scores their first try Action Images via Reuters/John Sibley

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Alastair Grant/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Hollie Adams/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery prepare to fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Hollie Adams/Pool via REUTERS

Vials of the AstraZeneca and Pfizer-BioNTech Comirnaty coronavirus disease (COVID-19) vaccines are pictured in a General practitioners practice in Berlin, Germany, April 10, 2021. REUTERS/Fabrizio Bensch

Members of The King's Troop Royal Horse Artillery prepare to fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Hollie Adams/Pool via REUTERS

Members of The King's Troop Royal Horse Artillery prepare to fire a gun salute to mark the death of Britain's Prince Philip, husband of Queen Elizabeth, at the Parade Ground, Woolwich Barracks in central London, Britain April 10, 2021. Hollie Adams/Pool via REUTERS

A man receives a dose of the Pfizer-BioNTech Comirnaty coronavirus disease (COVID-19) vaccine by general practitioner Peter Karsten in a doctor's practice in Berlin, Germany, April 10, 2021. REUTERS/Fabrizio Bensch

A man receives at his home a dose of the AstraZeneca coronavirus disease (COVID-19) vaccine by general practitioner Peter Karsten in Berlin, Germany, April 10, 2021. REUTERS/Fabrizio Bensch

Rugby Union - European Challenge Cup Quarter Final - Leicester Tigers v Newcastle Falcons - Welford Road Stadium, Leicester, Britain - April 10, 2021 Newcastle Falcons' Tom Penny in action with Leicester Tigers' Kini Murimurivalu Action Images via Reuters/John Sibley

Children holding flowers stand outside Buckingham Palace after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in London, Britain, April 10, 2021. REUTERS/Henry Nicholls