Noel Clark was reportedly arrested over an allegation of voyeurism days after losing a £6million libel case with the Guardian newspaper.
The Doctor Who star, 49, was detained by police at his family home in Kensington, west London, and taken into custody for questioning last week.
Officers visited his home just before 9am on Thursday, along with a specialist dog unit, to conduct a search of the apartment.
They spent at least five hours combing through his home, with officers seen leaving with boxes containing laptops and documents.
The reason for Clarke's arrest was unknown at the time, however The Sun has now claimed it was over an allegation of voyeurism against a woman in her 20s dating back to February 2013.
