A source of an anthrax can be a subject of a criminal investigation.
A person may have knowledge of a direct link of (anthrax incidents).
Perpetrators can be constituted-of-or-filled-with (anthrax attacks).
Information may lead to an arrest of perpetrators of (anthrax attacks).
Threats of (anthrax attacks) can be transgressions of a public trust.
Threats can be constituted-of-or-filled-with (anthrax attacks).