Detectives investigating a violent burglary which left a homeowner with "extreme" facial injuries have released new CCTV images of a suspect fleeing the scene.
The footage, which was taken about a minute after the attack in Wimbledon, south west London, depicts a panicked man fleeing through Wimbledon Theatre car park. He can be seen removing surgical gloves but was not picked up on CCTV after this.
Police previously released an image of the horrific injuries suffered by the victim, who has been named in reports as university law lecturer Paul Kohler.
Officers were called to the property in Kings Road at 10pm on Monday following reports that a burglary was taking place.
Police said officers were on the scene within minutes and arrested two suspects in their late 20s but two others made off on foot - with one of them being caught on CCTV.
It is not known which direction the fourth man headed in. Both remain at large and are believed to be aged about 20 to 30, and of Eastern European heritage.
It is understood the 55-year-old victim opened the front door to four balaclava-clad men who entered his home. They then violently assaulted him and repeatedly shouted: "Where's the money?"
The man was attacked, while a 50-year-old woman was threatened by two men who attempted to tape her down to a chair.
Their daughter and a man, both in their early 20s and who were upstairs at the time, managed to call 999 for help from a locked room.
The injured man is in a south London hospital receiving treatment for multiple facial injuries and bruising to his body and limbs. He is undergoing surgery and treatment for a fractured eye socket.
A number of personal items stolen in the burglary are all believed to have been recovered after being discarded and a large kitchen knife was found close to the scene, police said.
Officers are also keen to speak to anyone who saw a silver Volkswagen two-door cabriolet-style car which was believed to have been used by the suspects.
Detective inspector Dan O'Sullivan, of Merton burglary squad, said: "This new piece of CCTV is crucial in the identification of one of the outstanding suspects, and we are calling on anyone who recognises this man to come forward.
"It is my firm belief that this man and his other outstanding associate, would have been stained with blood spatter from the violent attack inside the house. Both were also wearing white surgical gloves when they fled. Whilst they attempted a quick exit, I'm sure that members of the public would have seen them.
"The victim currently remains in hospital and is awaiting surgery to an extreme eye injury which has led to the fracture of his socket. The level of violence used is unprecedented for this borough and we believe that the motive for this horrendous crime is purely for financial gain, and the attackers thought there was cash within the property."
Anyone with information is urged to call the incident room on 020 8649 3159 or Crimestoppers, anonymously, on 0800 555 111.
:: Two men have appeared in court charged with aggravated burglary and grievous bodily harm and been remanded in custody until another court appearance later this month.