An official investigation has been launched after a letter containing white powder was addressed to Meghan Markle at Kensington Palace. Thanks to security measures, the package was intercepted before it reached the engaged couple, who have been told of the incident, according to London's Evening Standard.
Police are also investigating an allegation of malicious communications in relation to the letter.
"Police are investigating after a package containing a substance was delivered to St James's Palace on Monday, 12 February".
Ms Markle and Prince Harry are due to ride around a public route to greet crowds in a carriage after they Wednesday at St George's Chapel.
After conducting tests on the power, experts concluded that the contents were harmless. Investigators are treating the incident as a "racist hate crime", the statement added.
"His girlfriend, Meghan Markle, has been subject to a wave of abuse and harassment". Markle, a successful actor who recently bowed out of her most prominent role in USA legal drama "Suits", is from a mixed-race background.
The letter claimed the powder was anthrax, which can be deadly, but after it was examined by officers from Metropolitan Police's counter-terrorism unit, it was found to be harmless.
Earlier this month, a letter containing a white powder was sent to Parliament, which caused a partial evacuation. The investigation is ongoing, though there have been no arrests so far. Kensington Palace had no comment.