Police say they are treating as a racist hate crime a letter containing white powder sent to Meghan Markle, which sparked an anthrax scare.
The letter was received this 
month at St James’s Palace in central London. The powder inside was found to be harmless after being examined by experts.
It is understood the package contained a racist note and was received on February 12.
The force added: The matter is being investigated by officers from the Met’s Counter Terrorism Command.
Markle, a successful actress, is from a mixed-race background.
The couple are due to be married in May. The letter was received at the palace shortly before a package containing white powder also prompted a scare at the Palace of Westminster.
Prince Harry has acknowledged dating American actress Meghan Markle for over a year before they announced their engagement. During their first interview as a couple on Nov. 27, 2017, they revealed they first met on a blind date, introduced by a common friend in early 2016.
The Evening Standard newspaper said the royal couple had been informed of the suspicious package.
The police inquiry is trying to determine if the same person or people were responsible for the sending both letters.
Anthrax can be weaponized in powder form and is potentially deadly. But there have been a number of scares where harmless white powder has been sent to prominent people.
The substance was tested and confirmed as non-suspicious. Officers are also investigating an allegation of malicious communications which relates to the same package. No arrests; inquiries continue.
A spokesperson for St James’s Palace said they would not comment and it was a matter for the police.