This is the moment heroic members of the public took a suspected knifeman to the ground in Leicester Square.
Police were called to reports of a man with a knife threatening members of the public in Leicester Square, Westminster, at 1.08am on Sunday, September 21.
Four men, aged in their 20s and 30s, sustained injuries not thought to be life-threatening or life-changing.
Met Police officers arrested a 50-year-old man on suspicion of grievous bodily harm, possession of an offensive weapon, grievous bodily harm, affray and possession of a Class B drug.
He has since been detained under the Mental Health Act, the force said.
Shocking footage posted online shows a group of men pinning the alleged attacker to the floor.
The man, who was wearing a black coat, trousers and a blue rucksack, can then be seen holding up what appears to be a knife and ordering everyone to ‘get away’ before standing up.

Shocking footage posted online shows a group of men pinning the alleged attacker to the ground

Two of the brave passersby are then seen in a stand-off with him before a security guard ran over and tackled him back down to the ground as he screamed

Blood can be seen covering the alleged attackers hands before another security guard appeared to find the knife discarded on the ground
Two of the brave passersby are then seen in a stand-off with him before a security guard runs over and tackles him to the ground as he screams.
Blood can be seen covering the alleged attacker’s hands before another security guard appears to find the knife discarded on the floor and walks away with it.
A spokesperson for the Met said: ‘We were called at 01:08hrs on Sunday, 21 September to Leicester Square, Westminster to reports of a man with a knife threatening members of the public.
‘Officers attended and found four men, aged in their 20s and 30s, with injuries. They are not believed to be life-threatening or life-changing.
‘A 50 year-old-man was arrested at the scene on suspicion of grievous bodily harm, possession of an offensive weapon, grievous bodily harm, affray and possession of a Class B drug. He has since been detained under the Mental Health Act.
‘Anyone with information is asked to contact police on 101 or online, quoting CAD 445/21SEP. Or you can contact Crimestoppers anonymously on 0800 555 111.’