Armed officers "forcibly stopped" the car of a man suspected of killing one of Britain’s richest men, an eyewitness has told Sky News.
The 34-year-old was arrested in west London – more than 100 miles from where millionaire hotelier Sir Richard Sutton was stabbed to death at his home in Dorset.
A vehicle believed to be linked to the incident was located following "fast-time enquiries", and six police forces were involved in tracking its journey.
Maureen Kane, whose Chiswick home overlooked the road where officers intercepted the suspect late on Wednesday night, told Sky News she heard a crash and saw armed officers pull a man out of a car.
"I looked out of the window and saw about 20 police cars, they were swerving to block this car in, and there were police officers all around the car with what looked like machine guns pointed at it.
"I thought it was a scene from a movie at first…
"There were lights flashing and so much shouting – it was so noisy and chaotic.
"The police officers just kept shouting at him: ‘What’s your name? What’s your name?’"
She added that when police pulled the man out the car he was "covered in blood".
"The police put him on a stretcher and covered him in a silver blanket.
"Then an air ambulance arrived, and the paramedics started treating him – they treated him for about 30 minutes before taking him away."
Dorset Police has confirmed that the man was subsequently taken to hospital for treatment to injuries that are not believed to be life-threatening.
Sir Richard and a woman – named in reports as his wife – had been attacked during an incident in Higher Langham, near Gillingham.
The 83-year-old was declared dead a short time later, while the woman, aged in her 60s, was airlifted to Bristol’s Southmead Hospital in a critical condition.
According to detectives, the arrested man and the victims were known to each other.
A statement from Sir Richard’s company said: "Sir Richard was a caring, generous and warm family man, who genuinely regarded those who worked for him as part of his extended family.
"Sir Richard was passionately devoted to both his company and its people, setting the highest standards for quality in the hotel, farming and property interests within the group.
"His loss will be felt by everyone within the company, those who worked with him, and his family who have lost an incredible individual. Our thoughts are with the Sutton family at this tragic time."
According to The Sunday Times, Sir Richard’s fortune is worth £301m, making him the 435th-wealthiest person in the country.
He owned the five-star Sheraton Grand and Athenaeum hotels on London’s Park Lane.
The entrepreneur had an extensive property and farming portfolio, including the 6,500-acre Benham Estate in West Berkshire and the Stainton Estate in Lincolnshire.
Dorset Police’s Major Crime Investigation Team is leading an investigation into what happened.
Detective Inspector Simon Huxter, who is leading the investigation, said: "Our thoughts are with the family of the man who sadly died and the injured woman at this extremely difficult time and they are being supported by specially trained officers.
"We will be carrying out a full investigation to establish exactly what happened at the address in Higher Langham, and I would appeal to anyone who saw or heard anything suspicious in the area on the evening of 7 April to please contact us."