Met Police: Three diplomatic officers held over 'obscene' images
8 February 2014 Last updated at 01:30 GMT
Three police officers have been arrested for allegedly exchanging "extreme" pornographic images.
The Metropolitan Police said three constables were arrested in December suspected of involvement in "possession and distribution of obscene images".
The officers are from the Diplomatic Protection Group, which guards foreign embassies and controls access to New Scotland Yard and Downing Street.
Alex Forsyth reports from Westminster.