A Scotland Yard statement said: “Police are investigating after a package containing a substance was delivered to St James’s Palace on Monday, 12 February.
“The substance was tested and confirmed as non-suspicious.
“Officers are also investigating an allegation of malicious communications which relates to the same package, and it is being treated as a racist hate crime.
“The matter is being investigated by officers from the Met’s Counter Terrorism Command.
“No arrests; enquiries continue.”
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