Moment armed police arrest TikToker poking his microphone under nose of King's Guard horse and its rider - and he'd previously been held outside Downing Street too

A TikToker posting videos of himself winding up police outside Buckingham Palace has been arrested after shoving his microphone under the nose of a King's Guard and his horse in London.

The prankster, known by TikTok handle ymusa18, was cuffed and carted off after he began confronting people who criticised him for harassing the guardsman and his mount while tourists tried to take pictures on Thursday.

Similar to Mizzy, the lawbreaking prankster who has since vowed to change his ways, the prankster films himself harassing members of the public - and was searched outside Downing Street for appearing to suggest he was carrying a bomb.

But his most recent stunt outside the Household Cavalry Museum on Whitehall saw him confront members of the public who disliked his pranks - and was then grabbed and pinned to a fence by armed police officers as he pleaded with them for calm.

Multiple angles of the incident have been shared online - including by the fame-hungry prankster himself - after it happened earlier this week.

Labelling it 'interviewing the Royal Guard and their horses' in his own version of the clip, the joker holds a microphone to the horse's muzzle and asks it for its name - cutting directly across a bewildered tourist posing for a photograph.

He is filmed the entire time by a friend, who shoots the footage for the TikTok video from a distance. 

The Royal Guard maintains a professional facade throughout even as the prankster hits him with inane questions about riding the horse - but eventually members of the public tire of his antics and call him out.

'Stop being so God-damn rude. F*** off, you rude b******,' says one man, whom MailOnline has identified as a YouTuber who regularly films videos of tourists outside the museum.

Another member of the public, realising ymusa18 is filming the video for an online prank, then moves to cover the lens and disrupt the video - outraging the young TikToker, who walks over saying: 'That's my phone, man, you can't touch that.'

'Go on, p*** off,' says the earlier YouTuber - to which the youngster replies: 'Say that to my face.'

'P*** off,' the videographer says again, pushing the joker back as he gets too close for comfort.

The angry TikToker then launches into a rant, yelling over and over: 'Who the f*** you touching?'

As he yells at the cameraman, two armed police officers, one male and one female, come bounding out from the gates of the museum gripping sub-machine guns.

The male officer places his hand on the prankster's chest and pushes him backwards, announcing sternly: 'Get back.'

The prankster protests rapidly: 'I didn't do s***, I didn't do s***, did you not see what happened, mate? I'm calm, I'm calm, no need to grab my neck bro, no need to grab my neck. I did not threaten no-one, you know.'

As he is told he is being arrested on suspicion of a public order offence, he stops talking - and remains silent as he is frogmarched inside the museum's gates.

In his own clip, as he is taken inside the compound, he flashes a grin to the camera. 

Like other parts of Whitehall and nationwide locations of utmost national security, the Household Cavalry Museum is protected by the Ministry of Defence Police rather than the Metropolitan Police.

MailOnline has contacted the MoD for comment.

Ymusa18's TikTok features him harassing members of the public on trains where he pretends to fall asleep on passengers.

He also pulls what he terms 'Uber pranks', where he climbs into the back of police vehicles as if they are taxis - to the annoyance of the officers inside.

But his other 'jokes' put him at much greater risk - including outside Downing Street, where he said, in full view of armed police: 'Rishi Sunak, I've got a message for you. If I see you on the street, there's gonna be problems, you get it?'

He adds: 'Your little minions, they ain't going to do nothing about it' - immediately before an armed police officer opens the gate and tells him to behave.

Sometime later, he is led away by police further down Whitehall after seemingly suggesting he had an explosive in his bag.

'You tried to say you've got something in your bag,' a police officer can be heard saying. 'You mentioned C4 (a plastic explosive).'

The video ends with him stepping out of Charing Cross Police Station boldly proclaiming: 'Yes lads, I'm free now. The police can't hold me. What have I done? I'm innocent, yeah?'

He also dared police to arrest him after crossing the threshold of the gates at Buckingham Palace in front of armed cops, who told him: 'Don't push your luck.'

In a subsequent video, he promised to scale the gates of Buckingham Palace if the clip got 5,000 likes, a figure he later revised to 15,000. It now has 36,000.

'Get me to 10k and I'll post more serious (videos),' he says in his bio.