Prince Harry,Meghan Markle
Photo: Getty

London police are investigating after a suspicious letter containing white powder was sent to Prince Harry and Meghan Markle last week. The substance was analyzed and found to be harmless. However, the letter was “understood to contain a racist message,” the Evening Standard reports.

The letter was delivered on February 12 to St. James’s Palace, where Harry’s office is located. (It’s over two miles from Kensington Palace, where he and Markle live, next to Prince William, Kate Middleton and their children.) The parcel was intercepted before it reached the couple, but they’ve reportedly been informed of the situation, Evening Standard adds.

Related article: The Real Reason Pippa Middleton Has Disappeared From The Spotlight

The following day, police revealed a package with white powder—which was also found to be harmless—was sent to Parliament. The two events are believed to be linked. No arrests have been made yet.

Prince Harry,Meghan Markle
Photo: Getty

This unfortunately isn’t the first time Markle, who is biracial, has been targeted by racist threats. When Prince Harry first announced he and the actress were dating in November 2016, he disapproved of the racially charged harassment pointed at Markle online.

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“Some of this has been very public—the smear on the front page of a national newspaper; the racial undertones of comment pieces; and the outright sexism and racism of social media trolls and web article comments,” his communication secretary said in a statement.

Markle responded to the harassment in her first interview with Harry post-engagement. “It’s disheartening,” she told BBC. “You know it’s a shame that that is the climate in this world to focus that much on that or that that would be discriminatory in that sense, but I think, at the end of the day I’m really just proud of who I am and where I come from, and we have never put any focus on that. We’ve just focused on who we are as a couple.”

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One offense even occurred within the royal family. In December, Princess Michael of Kent—who is married to the Queen’s cousin and who has made racist remarks in the past—wore a blackamoor brooch to a Christmas luncheon at Buckingham Palace that Markle also attended. The gesture was seen as racially offensive. She later apologized, with a spokesperson saying she was “very sorry and distressed that it has caused offense.”

This post originally appeared on Harper’s Bazaar US.