DJ Neil Fox has been bailed after he was arrested over alleged sex offences against two women.
The 53-year-old Magic presenter, known as Doctor Fox, was questioned at a police station in central London yesterday.
Scotland Yard did not name the broadcaster, but said o fficers from Westminster had arrested a 53-year-old man following four allegations of sexual assault against two women.
"Three of the allegations are historic, one from earlier this year," the statement said.
"The man was arrested at a business address in W1 and taken to a central London police station. Officers subsequently searched addresses in SW6 and the Littlehampton area of West Sussex.
"The man has now been bailed to return on a date in early December pending further inquiries."
A spokesman for Bauer Media confirmed Fox, presenter of the Magic Radio breakfast show, had been arrested.
He said the presenter would be off air from today " to enable him to devote his full attention to dealing with these matters".
The spokesman added: "All other aspects of his contract will remain unchanged while matters are resolved. We can make no further comment at this stage."
His arrest is not part of high profile sex crime investigation Operation Yewtree.