May 16 (UPI) -- Homeland Security Secretary Kristi Noem announced Thursday night that DHS and the Secret Service are investigating a since-deleted picture former FBI Director James Comey published online as a threat targeting President Donald Trump.

"Disgraced former FBI Director James Comey just called for the assassination of @POTUS Trump," she said online. "DHS and Secret Service is investigating this threat and will respond appropriately."

Comey had published the now-deleted photo to Instagram. It showed shells on a beach arranged to form the numerals "86 47."

"Cool shell formation on my beach walk," Comey had written in the caption.

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