Prince Harry and his soon-to-be-royal fiancée Meghan Markle have been the victims of a "racist hate crime", according to British Metropolitan Police.
A package, addressed to the pair and sent to Kensington Palace, was delivered on Monday, February 12 (local time).
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It contained a racist letter, according to reports, and a white powder alleged to be anthrax - a bacterium that causes bowel, lung and skin issues which can prove fatal.
Police are now investigating the incident.
Markle, who is of African-American heritage, has been the subject of racist abuse on a number of occasions after she was confirmed to be in a relationship with Prince Harry.
In the most well-known incident, UKIP leader Henry Bolton's girlfriend Jo Marney claimed the former Suits actress would "taint" the royal family with "her seed".
"This is Britain, not Africa," she wrote in a text. "She's a black American. Pushing their way to the top slowly. Next will be a Muslim PM and a black king."
The delivery of the racist package comes less than two weeks after Vanessa Trump, the daughter-in-law of US President Trump, received a package containing a hostile letter and a mystery white powder.
The powder was later found to be corn starch.
Newshub.