A man has been caught on camera headbutting a supermarket customer as he walked out of a shop.
The shocking clip shows a man in a black polo shirt headbutt another man, who was allegedly threatening staff at a Co-op store in Poole, Dorset.
The man, who was left with a bloody nose, apparently became irate after being followed around the store by shop workers.
In the video, a man wearing a white t-shirt and tracksuit is seen squaring up to another, who speaks with a Scottish accent.
A woman is heard shouting in the background trying to diffuse the situation.
One of the men can be heard saying: “What just because you are Scottish you think you are bad. I will f**k you up!”
The man in black suddenly lunges forward with his head, cracking the man on the nose.
The woman then exclaims: “Oh f*****g hell, call the police!”
Blood begins to run down the man's nose, who appears unmoved by the incident.
The man with the Scottish accent said: “Don’t threaten me. Don’t f****** threaten me!”
The bleeding man then says on camera: “I will put a Stanley blade in your throat now c**t.”
The woman standing at the store entrance says: “I’ll tell you what just back off, leave please.
The man picks up his bag and says: "F*****g pathetic man.”
The man in black reiterates to the customer: “Don't threaten me, don’t threaten staff. None of this is okay. Do one.”
The man adds: “I’ve been in this shop yeah, and I have been followed about for no f*****g reason.
"Just because I am wearing this.”
The woman near the door is then heard saying: “I told you why he is a security guard and that is what he does.”
The dramatic footage was uploaded to Facebook on Saturday with the caption: "Creekmoor" in reference to the area it took place in, and has been viewed more than 635,000 times.
Police today confirmed they are investigating the incident.
A Dorset Police spokesman said: "At around 5.40pm on Friday April 24, Dorset Police received a report of a customer being verbally abusive toward a member of the security staff at the Co-Op store in Creekmoor in Poole.
"It was further reported that the same male customer made threats toward a member of the public outside the store.
"There was an altercation outside the store and the customer was reportedly assaulted by the member of the public.
"Officers have spoken to all individuals involved and are carrying out an investigation into the incident.
"No arrests have been made at this stage."
