A letter containing white powder addressed to Prince Harry and Meghan Markle has arrived at Kensington Palace after which the police have launched an urgent investigation, reported The Sun.
The letter was intercepted before reaching the couple but a full security scare was sparked over fears it could contain anthrax. The couple have been informed of the incident.
Extensive tests revealed that the powder was harmless but Scotland Yard is now said to be on high alert ahead of the royal wedding in May.
Officers from the Metropolitan Police Counter Terrorism command were called in after the letter was sent to Kensington Palace on Monday, February 12 - a day before the Prince and Ms Markle travelled to Edinburgh for their most recent public appearance.
Detectives are now investigating who sent the letter, and whether it is linked to white powder posted to the Palace of Westminster in the same week.
A huge security operation will be under way amid the service. The pair is set to embark on a carriage procession along a route around Windsor Castle to meet wellwishers.
A spokesman for Kensington Palace did not comment, reported Telegraph.
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