4 March 2014
One of David Cameron's aides has been arrested on suspicion of an offence "relating to child abuse imagery", Downing Street has said.
Patrick Rock, 62, resigned as the deputy head of the policy unit on 12 February.
Number 10 said it had been made aware of a potential offence and referred the matter to the National Crime Agency, which arrested Mr Rock at his home a few hours later on 13 February.
The NCA has not confirmed the arrest.
A Downing Street spokesman said that following Mr Rock's arrest, it "arranged for officers to come into Number 10 [to] have access to all IT systems and offices they considered relevant".
The prime minister was immediately informed and kept updated throughout, he said.