LONDON - London police say they are investigating a suspicious package that was sent to Prince Harry and his fiancee Meghan Markle.

The Metropolitan Police force says "a package containing a substance" was delivered to St. James's Palace, where Harry has his office, on Feb. 12.

UK Police Investigating Package Sent to Harry and Meghan

It says the substance "was tested and confirmed as non-suspicious."

UK Police Investigating Package Sent to Harry and Meghan

The force said Thursday that detectives are investigating an offense of malicious communication in relation to the package. The Evening Standard newspaper says it contained a racist message.

UK Police Investigating Package Sent to Harry and Meghan

The prince and Markle are due to marry May 19 at Windsor Castle.

Earlier this month a letter containing white powder was sent to an office at Parliament, leading to a partial evacuation of the building. It also was found to be non-toxic.