The Federal Bureau of Investigation is investigating social media posts by at least seven different accounts that appeared to indicate foreknowledge of the assassination of Charlie Kirk, according to three people familiar with the investigation and screenshots obtained by the Washington Free Beacon.

The posts—one of which referenced the date of Kirk’s assassination, September 10, more than a month before it took place—were all deleted in the days following the killing.

Several of the accounts appear to belong to transgender individuals, and at least one of them followed suspect Tyler Robinson’s roommate, with whom Robinson was allegedly in a relationship, on TikTok.