Home Office civil servant David Tracey, 48, works in a Whitehall unit that spearheads strategy on tackling terrorism, The Sun reported.
Tracey was arrested by Essex police and charged with making indecent images of children.
He appeared at a court on November 14 and has been bailed till January 8.
Tracey has been suspended from duty at the Office for Security and Counter-Terrorism (OSCT), where he had access to plans of Buckingham Palace.
The OSCT works closely with the MI5 and police to help keep the public safe from terrorism.
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