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According to The Guardian, British law enforcement authorities are investigating an incident involving a letter that contained white powder, which was addressed to Prince Harry and American actress Meghan Markle.

Terror cops were called in after the letter was sent on February 12 - a day before cops revealed a package containing white powder had been sent to the Palace of Westminster. Scotland Yard officials confirmed to the publication that they were aware of the letter and had launched an investigation.

Officers from the Met's counter-terrorism command were called in after the letter was received at St James's Palace, for sorting, on February 12, the Standard said.

Prince Harry and Meghan Markle, who announced their engagement in November, are due to marry in Windsor this May, and now live at Nottingham Cottage on the grounds of Kensington Palace.

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The Evening Standard said the letter addressed to the royal couple at the Kensington Palace "sparked a full security scare with specialists being rushed in to check the material". Ms Markle, a successful actor, is from a mixed-race background. The investigation is ongoing, though there have been no arrests so far.

The following day, another letter was sent to the Palace of Westminster for Home Secretary Amber Rudd.

However, neither Kensington Palace, where Harry and Meghan live, nor the Metropolitan Police has confirmed if this was the case.

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