LONDON — A senior aide to Prime Minister David Cameron has been arrested and has resigned after images potentially related to child pornography were found on computers.

Cameron’s Downing Street office says officials found out about the potential offense on Feb. 12 and notified the National Crime Agency. A spokesman says Patrick Rock was arrested at his home the next day.

It says police have searched information systems and offices at Downing Street.

The Daily Mail first reported Rock’s arrest and his resignation, which were confirmed by Downing Street.

The 62-year-old Rock served as deputy head of a Downing Street policy unit and was also advising the government on its plans to have Internet providers use filters to prevent the distribution of child pornography.

He has long ties to the Conservative Party.

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