The publicist Max Clifford has spoken out against allegations of sexual abuse relating to the 1970s calling them "damaging and totally untrue".
Clifford, 69, from Surrey, was arrested at 7.40am on suspicion of sexual offences and was questioned at Belgravia police station for much of the day.
Police said in a statement that a man from Surrey arrested this morning had been bailed to appear at a later date, adding: "We are not prepared to discuss further."
ITV News' correspondent Geraint Vincent reports:
Warning: This report contains flash photography from the start.
Speaking on the steps outside the police station, he said:
– max clifford
These allegations are damaging and totally untrue.
On a personal level they are very distressing for myself, my wife, my family and loved ones.
Anyone who really knew me all those years ago ... will have no doubt that I would never act in the way [that] I have today been accused.
Scotland Yard said a man in his 60s was arrested as part of Operation Yewtree - the investigation into allegations of sex abuse surrounding Jimmy Savile and others.
The arrest is not believed to be related to any claims involving Savile.
Mr Clifford said that the allegations relate to 1977 but refused to comment on who may have brought them.
An earlier statement from the Metropolitan Police said:
– Scotland Yard
Officers working on Operation Yewtree have this morning, Thursday 6 December, arrested a man in his 60s [Yewtree 6] in connection with the investigation.
The man from Surrey was arrested at 07:40hrs on suspicion of sexual offences and has been taken into a central London police station.
The individual falls under the strand of the investigation we have termed 'Others'.
We are not prepared to discuss further.
Max Clifford's lawyer Charlotte Harris said he would assist the police "as best he can with their inquiries" following his arrest.
A statement said:
– Charlotte Harris, Lawyer
Max Clifford is being interviewed by police.
Mr Clifford will assist the police as best he can with their inquiries.
When we are in a position to provide further information, we will.