What does 8647 mean? Why James Comey's Instagram post triggered federal response

 

A photo of seashells and a series of four numbers have landed former FBI Director James Comey in hot water. Federal law enforcement officials said on May 15 that they are investigating an Instagram post Comey made depicting an image reading “8647.” Some supporters of President Donald Trump interpreted the post as a threat against Trump. Comey took down the photo and said in a subsequent Instagram post that he was unaware the message could have been associated with violence. A federal law enforcement official told USA TODAY on the condition of anonymity that the Secret Service was sending agents to question Comey about his post.