According to mourners who witnessed the incident, police tackled a man who tried to approach the coffin of Queen Elizabeth II.
Thousands of people line up to pay their respects to the monarch who died a week ago.
The man dressed in black tried to remove the Royal Standard from the coffin before he was arrested.
“It was quite shocking, but it lasted just two or three seconds before they carried him away,” said Paul Denton, a broker from the UK.
Christine had been in the line for 14 hours.
When the man was tackled to the ground, the soldiers keeping watch by the coffin didn’t flinch.
Ms. Chan said that her husband and mother-in-law were watching the live stream to pay their respects and that it cut away to an outside view as they got in the hall.
The mourners must pass through airport style security barriers to enter the hall.
The man who was roller blading into the path of King Charles III’s motorcade was taken into custody earlier in the evening.
The man was taken into custody by the police after a fight in the hall.