An American diplomat accused of possessing indecent images of children was "secretly flown out of the UK", according to reports.
US authorities allegedly raided the diplomat's London flat last month, seizing him and taking him to a US airbase for removal, The Sun reported.
US personnel have no powers of arrest in the UK and, The Sun reported, there was no formal request to extradite the man.
UK ministers are understood to be in contact with the US embassy over the incident.
The man's seizure is reported to be related to an investigation into another person in the US.
A Metropolitan Police spokesperson said: "On Tuesday August 25, US authorities made us aware of an investigation they are conducting into suspected offences in London relating to indecent images of children.
"We continue to liaise with them regarding this matter."
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A UK government spokesperson said: "We expect all foreign diplomats in the UK to abide by our laws, in the same way we expect all UK diplomats to do so when posted overseas.
"As a US investigation is ongoing, it would not be appropriate to comment further at this stage."
The Press Association has contacted the US embassy for comment.
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