The U.K. began its four-day celebration to mark Queen Elizabeth II's Platinum Jubilee with a military parade and a gathering of large crowds in central London.

Britain Platinum Jubilee

The first of four days of celebrations to mark the Platinum Jubilee took place in London.

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The end of the air show and military parade will be witnessed by the Queen and working royals from the balcony of Buckingham Palace.

Many people carrying the Union Jack flag have gathered near Buckingham Palace and London's Trafalgar Square to watch the parade.

The 96-year-old is Britain's longest-reigning monarch and the first to complete seven decades on the throne.

The celebrations come after a difficult few months for the Queen who contracted Covid-19 in February and has since had to cut back on public appearances due to health concerns.

Buckingham Palace said that the Queen may not be present at many of the Jubilee events due to mobility problems.

The start of the parade was disrupted by two people who were arrested.

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I would like to thank everyone who has been involved, and hope that the coming days will give us an opportunity to reflect on what has been achieved.

Prince Charles, William and Kate will be on the Buckingham Palace balcony with the Queen. George, Charlotte, and Louis were in a carriage for the first time at the parade and are expected to be a big part of the event. The Queen's other grandson Harry and his wife Megan will not be seen on the balcony as they are no longer working royals.

Britain Platinum Jubilee

Prince George, the heir to the throne, and his family left Buckingham Palace.

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Britain Platinum Jubilee

Prince William and Princess Anne are both Colonels of the Irish Guards.

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Britain Platinum Jubilee

Prince George, Prince Louis and Princess Charlotte are riding in a carriage.

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Britain Platinum Jubilee

Queen Elizabeth II is on the balcony of Buckingham Place.

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Britain Platinum Jubilee

A young royal fan smiles as she stands next to the Mall in London.

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Britain Platinum Jubilee

A group of royal fans gather on the Mall in London to go to Buckingham Palace.

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Britain Platinum Jubilee

The Welsh Guards are on their way to London.

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Britain Platinum Jubilee

Members of the Household Cavalry are going towards the Horseguards Parade.

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Platinum Jubilee

Crowds gathered in front of the Houses of Parliament in London on the first day of the Platinum Jubilee celebrations.

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Platinum Jubilee

Edinburgh Castle will mark the start of the Platinum Jubilee celebrations.

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