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A Saudi diplomat was accused of bringing a personal slave to Britain, Boris Johnson has told MPs.

But the official may have walked free, as they have diplomatic immunity.

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.

It says a Saudi Arabian diplomat was accused of "Human Trafficking into the UK for purposes of exploitation, specifically domestic servitude".

Elsewhere in the statement, Mr Johnson revealed a Mexican diplomat had been accused of making child sexual abuse images and forcing a child under 15 to watch pornography.

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

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 In the case of the most serious alleged offences, the diplomat in question would be immediately withdrawn from the country unless they cooperate with any investigation under a waiver of immunity granted by their mission.”

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sorts of offences must not be allowed to walk free back in their home country- it is not enough that they are simply withdrawn from the UK.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.”