PRINCE Harry and Meghan Markle have been caught up in a frightening anthrax scare after an envelope containing white powder was sent to Kensington Palace.
The letter was personally addressed to the royal couple but was intercepted by staff before it reached them.
Analysis of the powder found that it was harmless.
According to the Evening Standard, the incident is being played down officially by police but it has put Scotland Yard on high alert ahead of the royal wedding.
Ms Markle and Prince Harry are due to ride around a public route to greet crowds in a carriage after they wed at St George's Chapel.
The carriage procession will travel along a route through the streets of Windsor before heading back to Windsor Castle.
"They hope this short journey will provide an opportunity for more people to come together around Windsor and to enjoy the atmosphere of this special day," Kensington Palace has said.
Last week, Vanessa Trump, the daughter-in-law of US President Donald Trump, was taken to a New York hospital after she opened a piece of mail containing an unidentified white powder that was later determined to be non-hazardous.
The wife of the President's eldest son Donald junior, had opened a letter addressed to her husband.
She complained of nausea following her exposure and two other people who were present were also taken to the hospital.
Early this month, an investigation was launched after a "white substance" was sent to former US President Barack Obama's office in Washington DC. The substance is thought to be baby powder.
There have been also be ongoing threats against the royal family.
Last October a terror suspect allegedly encouraged extremists to attack Prince George at school.
A 31-year-old man is due to face trial in connection with the threat in April.