A Downing Street spokeswoman has told that Mr Rock, 62, had been arrested by the National Crime Agency detectives over a “potential offence relating to child abuse imagery” after being the subject of a complaint of alleged “inappropriate behaviour”.
She has added that the Tory veteran was picked up at his home on February 13 and that officers were provided with access to all IT systems and offices at Number 10.
Mr Rock and Mr Cameron has a close relationship of two decades. Both the men used to work for Michael Howard when he was Home Secretary in the 1990s.
Mr Cameron has told during a visit to the Midlands on Tuesday: “Obviously when I heard these allegations I was profoundly shocked and remain profoundly shocked today.
“I have to be careful about what I say about this issue because a criminal investigation is under way.”
He has further said: “He did play an important role at Downing Street and he’s resigned that position.”
The Prime minister has defended the lag in releasing the information by saying: “I don’t think it would be right to pre-emptively brief out a criminal investigation and that’s why we did not do that.
“But as soon as questions were asked, as questions would inevitably be asked, we have given very full and straightforward answers, which is absolutely the right way to answer this.
“I’ve been clear right along and I was told about this issue pretty much as soon as it was discovered and I have been very clear we must handle this in an absolutely correct way and I am satisfied that is what No 10 Downing Street has done.”
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