Former Navy SEAL Convicted for Plotting to Harm Police with Explosives at California Protests
SAN DIEGO, Calif. — A former U.S. Navy SEAL was convicted by a federal jury on Friday for transporting explosives with the intent to harm law enforcement officers during the “No Kings Day” protests held in California last year. Gregory Vandenberg, 49, was found guilty of transporting explosives with intent to kill, injure, or intimidate, as well as attempting to transport prohibited fireworks into California, according to the Department of Justice.
The conviction followed a five-day jury trial and approximately three hours of deliberation. Prosecutors revealed that Vandenberg was traveling from El Paso, Texas, to San Diego, California, to participate in the June 2025 protests when he stopped in New Mexico to purchase six large mortar fireworks. During this stop, he reportedly told the store clerk that he intended to throw the fireworks at police officers during the demonstrations. He also inquired in detail about the gunpowder content, explosive power, and potential to cause harm, demonstrating premeditation.
Federal agents uncovered additional evidence including antisemitic clothing and messages expressing anger toward the U.S. government, underscoring the dangerous nature of the plot. The explosives involved were classified as prohibited fireworks under California law, and their transportation across state lines with intent to use them against law enforcement is a serious federal offense.
This case highlights the ongoing challenges law enforcement agencies face in maintaining public safety during politically charged protests. The Federal Bureau of Investigation and other federal agencies have increasingly focused on preventing violent acts at demonstrations nationwide, particularly those involving explosives or other weapons.
California authorities have been vigilant in monitoring the “No Kings Day” protests, which have drawn both peaceful demonstrators and individuals with violent intentions. The successful prosecution of Vandenberg sends a strong message about the consequences of attempting to use explosives against police officers.
The Department of Justice continues to emphasize its commitment to protecting law enforcement personnel and the public from acts of domestic terrorism and violence. According to Department of Homeland Security guidelines, transporting explosives with intent to harm individuals is a federal crime that carries severe penalties, including lengthy prison sentences.
Vandenberg’s conviction is part of a broader effort to crack down on violent extremism linked to protests and political unrest. The case also raises concerns about the radicalization of individuals with military backgrounds who may misuse their training and access to weapons.
As the nation grapples with increasing polarization and protests, federal law enforcement agencies remain vigilant in identifying and prosecuting threats before they can be carried out. The collaboration between local, state, and federal authorities was instrumental in thwarting this plot and ensuring public safety during the 2025 “No Kings Day” events.
For more information on federal efforts to combat domestic threats and protect law enforcement, visit the Department of Justice Domestic Terrorism page.
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