Japan's Emperor attends reception hosted by King Charles

Japan's Emperor has attended a reception hosted by Britain's King Charles III ahead of the state funeral for Queen Elizabeth II.

Emperor Naruhito and Empress Masako are in London to attend the funeral of Britain's longest-serving Queen.

At around 5 p.m. local time on Sunday, the Emperor, wearing a black facemask, headed for Buckingham Palace after leaving a hotel where he and his wife are staying.

The Emperor and other dignitaries, including Dutch King Willem-Alexander, were seen chatting and entering the palace before the reception began at 6 p.m.

During the one-hour gathering, the Emperor reportedly spent time with other royals and world leaders.

He also had a chance to personally give his condolences to the King and his wife Queen Consort Camilla on the eve of the Queen's funeral.

The Emperor then visited Westminster Hall where the Queen's coffin was lying in state.

The state funeral will be held at Westminster Abbey from 11 a.m. on Monday.