PR guru Max Clifford has been arrested at his home in Surrey by detectives investigating the Jimmy Savile sex abuse scandal.
The publicist was held at 7.40am on Thursday on suspicion of sexual offences and taken to a central London police station for questioning, a source confirmed.
He was arrested as part of Operation Yewtree, the investigation into allegations of sex abuse surrounding Savile and others.
Scotland Yard is leading the national probe into claims made against the disgraced TV presenter and figures in the entertainment industry.
Clifford is the fifth suspect to be arrested – and sixth person to be questioned – in connection with the Yewtree operation which has already cost around £2 million and involves a team of 30 officers.
A Met spokesman said: "The individual (held today) falls under the strand of the investigation we have termed 'Others'.
"We are not prepared to discuss further."
Last month Clifford publicly questioned where the police inquiry might lead and said a lot of old stars were worried about being dragged into the investigation because they had appeared on Top Of The Pops or Jim'll Fix It and had merely posed for photographs with girls and Savile.
"It is a situation which could easily turn into a witch hunt, a lot of big stars are frightened," he told ITV's Daybreak.
"Where is it going to end?
"I hope they (the police) concentrate on finding people like Jimmy Savile who were manipulating girls."
His arrest follows the questioning by detectives last week of a man in his 80s from Berkshire, as part of the investigation that does not directly relate to Savile.
Gary Glitter, comedian Freddie Starr, DJ Dave Lee Travis and a man in his 70s, reported to be former television producer Wilfred De'Ath, have been arrested and bailed as part of the probe.
Last month Scotland Yard said it was dealing with about 450 potential victims, the vast majority of whom claimed they had fallen prey to Savile.
Officers are looking at three strands within their inquiry: claims against Savile, those against Savile and others, and those against others.