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A Mexican diplomat in London allegedly made child abuse images and forced a child to watch pornography, Boris Johnson told MPs today.

But they may have used diplomatic immunity to avoid prosecution and walk free.

The bombshell was revealed in a statement from the Foreign Secretary, buried in a huge cache of information dumped by the Government on the last day before Parliament's summer break.

The statement does not say whether anyone was prosecuted for the offences.

But the Mirror understands two foreign diplomats and their families were asked to leave the UK last year.

The alleged crimes included in Boris Johnson's statement included taking an obscene photograph of a child and "using threatening /abusive/insulting words or behaviour to cause harassment/alarm/distress"

A second allegation said a child aged 13-15 was forced to "look at an image of sexual activity."

The Foreign Office would not comment on individual cases, but said: "The UK Government expects all foreign diplomats to abide by UK laws at all times and we take a firm line with diplomatic missions and international organisations whose diplomats commit offences.

"All alleged offences are investigated by the police or other law enforcement agencies. In the case of the most serious alleged offences, the diplomat in question would be immediately withdrawn from the country unless they cooperate with any investigation under a waiver of immunity granted by their mission.”

Elsewhere, the statement says a Saudi diplomat was accused of Human Trafficking and keeping a slave.

And diplomats from the USA, Kazakhstan and China were accused of driving under the influence of alcohol.

Lib Dem leader Tim Farron said: “Those committing crimes such as human trafficking, actual bodily harm and sexual offences against children must face justice.

“Diplomatic immunity should not provide a ‘get out of jail’ card for those perpetrating such serious crimes.

“The Foreign and Commonwealth Office must clarify whether these people have been prosecuted, whether their diplomatic immunity is still in place and what their current status is.

“Someone committing these sorts of offences must not be allowed to walk free back in their home country- it is not enough that they are simply withdrawn from the UK. The victims of these crimes must have justice, which can only happen if the perpetrators face proper prosecution.”