The bouncer was stabbed to death outside a private £12.5million townhouse in the upmarket area of Mayfair, Westminster, in the early hours of New Year’s Day. Police were called to the property at 5.36am on January 1. The man, believed to be in his early 30s, was working as a security guard for the private party and was found with multiple stab wounds. Related articles London stabbing as man attacked in broad daylight in Mayfair Police launch two murder probes after London New Year’s Day stabbings The man suffered his injuries after a group of men attempted to gain entry to the premises. But after paramedics and officers responded to his injuries, he was pronounced dead at 6.05am Two other men - aged 37 and 29 - and a 29-year-old woman were also stabbed in the attack. The three men were all working as security staff on the door of the private party. Mayfair killing: Police have launch an appeal for further information following the incident (Image: PA) Mayfair killing: A bouncer was stabbed to death by gatecrasher trying to gain entry to private party (Image: PA) Police said the woman was attacked as helped security staff close the front door of the property. They were treated at the scene before being taken to hospital. Their injuries are not believed to be life-threatening. The case is being treated as a murder investigation by police, who have so far made no arrests in conjunction with the brutal killing. The Met Police believed party-goers filmed the attack on their phones outside the luxury three-bedroom house. Related articles New Cross stabbing: Gang knife teenager in street as violence rages Horror as girl raped in broad daylight outside shopping centre Police are now appealing for witnesses to come forward with more information. Detective Chief Inspector Andy Partridge, said: “The incident took place outside a venue that was hosting a private party. I would like to hear from anyone who was present at that event and witnessed this incident. “A number of witnesses have already, but it is clear many others who were present are yet to be traced, some of whom may have captured the attack on their mobile phones. “It appears the deceased and the two injured males were working as security staff for the party, they were attacked by a group of males who were outside trying to enter the venue. Mayfair killing: Two other men and a woman were also stabbed but injuries were not life threatening (Image: PA) "The female was also attacked as she assisted the security staff in closing the front door of the premises. “This shocking incident happened just hours into a New Year, the area was particularly busy with people out celebrating and making their way home from various parties and organised events” “Please call the incident room with any information.” No arrests have been made in conjunction with the incident.All rights reserved for this news site express.co.uk and under his responsibility