US President Joe Biden arrived in Britain on Saturday evening to attend the funeral of Queen Elizabeth II, who died on September 8 at the age of 96.
Biden's plane landed at Stansted Airport outside London, and he is expected to bid farewell to the late queen's coffin and meet the new King Charles III on Sunday, before participating in the funeral service on Monday.
About 100 heads of state and government are scheduled to attend the state funeral.
Among the leaders who have already arrived are Canadian Prime Minister Justin Trudeau and Australia's Anthony Albanese.
Last Friday, New Zealand Prime Minister Jacinda Ardern bowed before a casket in Westminster Hall, and was one of the first leaders to arrive in London.
On Saturday, King Charles III met the leaders of 14 countries that fall under the British crown, such as Canada, Australia and Jamaica.
feelings of appreciation
On Saturday, hundreds of thousands of people stood for hours in a line along the Thames, waiting to see the casket and pay homage to the Queen, a testament to the impact she had on them.
Within the silent hall, some mourners cried while some of the current soldiers and veterans saluted their former commander, and some also got on their knees in line waiting.
The Queen's children spoke of how much they felt the people's love after the reactions to their mother's death, and King Charles and heir to the throne William shook hands with mourners in class and greeted them.
Amid salutations to Charles and heir to the throne William and chants of "God save the King", the two spoke to mourners at Lambeth Bridge, while mourners approached the end of the huge row to pass in front of the body lying in historic Westminster Hall.
The biggest security operation
London police describe the funeral as the largest security operation they have ever undertaken;
Heads of state and government, members of the royal family and huge crowds will gather in the streets.
The king visited the police headquarters on Saturday to thank the emergency services staff involved in the planning.
Emphasizing the risks, police said they had detained and then arrested a person after a witness told Sky News he had "run into the Queen's coffin".
Video footage showed policemen tying a man to the ground before taking him away.
It is noteworthy that Queen Elizabeth died on the eighth of this September, after ascending to the British throne for 70 years.