GLENDALE, Ariz. (NewsNation) — Federal officials are investigating "several threats of unknown credibility" toward expected attendees at Sunday’s memorial to slain conservative activist Charlie Kirk, two law enforcement sources have confirmed to NewsNation.

Threats against President Donald Trump, Vice President JD Vance and members of the Kirk family are among those being looked into, the sources said. The information regarding the threats was contained in a law enforcement memo issued by several federal agencies, including the FBI, the Department of Homeland Security and the Secret Service.

The sources confirmed there have not been any verified, credible threats made against the event, but rather threats of unknown credibility, which are not verified but still must be thoroughly investi

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