Southern District of New York | New York Man Charged For Making And Attempting To Use Improvised Explosive Devices In Manhattan

United States Attorney for the Southern District of New York, Jay Clayton; Assistant Director in Charge of the New York Field Office of the Federal Bureau of Investigation (“FBI”), Christopher G. Raia; and Commissioner of the New York City Police Department (“NYPD”), Jessica S. Tisch, announced today charges against MICHAEL GANN alleging that he manufactured at least seven improvised explosive devices (“IEDs”) using precursor chemicals—chemicals that can be combined to create an explosive mixture—that he had ordered on the internet, stored at least five IEDs and shotgun shells on adjoining rooftops of residential apartment buildings in the SoHo neighborhood of Manhattan, threw at least one IED onto the subway tracks of the Williamsburg Bridge, and subsequently lied to law enforcement about having disposed of his explosives and supplies in a dumpster.  This case has been assigned to U.S. District Judge Dale E. Ho.

“The safety of New Yorkers is paramount,” said U.S. Attorney Jay Clayton.  “As alleged, Michael Gann built explosive devices, stored them on a rooftop in SoHo, and threw one onto the subway tracks—putting countless lives at risk.  Thanks to swift work by our law enforcement partners, no one was harmed.  That vigilance assuredly prevented a tragedy in New York.”

“Michael Gann allegedly produced multiple improvised explosive devices intended for use in Manhattan,” said FBI Assistant Director in Charge Christopher G. Raia.  “Due to the successful partnership of law enforcement agencies in New York, Gann was swiftly brought to justice before he could harm innocent civilians shortly after his dangerous actions became known.  The FBI’s Joint Terrorism Task Force is enduring in its commitment and determination to protect the homeland.”

“This defendant allegedly stockpiled homemade explosives and traveled to New York City with these deadly devices,” said NYPD Commissioner Jessica S. Tisch.  “He threw one of these devices onto an active subway track and stored others on the rooftop of a residential building, but because of the skilled investigative work and swift response from the NYPD and our partners, we were able to intervene before he caused any harm.  I am grateful to the members of the NYPD, FBI, and the U.S. Attorney’s Office for all the work they do every day to keep New Yorkers safe.”

As alleged in the Complaint, Indictment, and public court filings:[1]

In or about May 2025, GANN ordered approximately two pounds of potassium perchlorate and approximately one pound of aluminum powder—precursor chemicals—online, along with over 200 cardboard tubes and over 50-feet worth of fuses.  In or about early June 2025, GANN received his packages containing the precursor chemicals and other supplies, mixed the precursor chemicals together, applied a flame to the mixture, and caused an explosion.  GANN subsequently assembled at least seven IEDs using the precursor chemicals, cardboard tubes, and fuses.

GANN stored the precursor chemicals and at least five IEDs, pictured below, on the rooftops of residential apartment buildings in SoHo.  The pictured black device contained approximately 30 grams of explosive powder—approximately 600 times the legal limit for consumer fireworks.

GANN also stored at least four shotgun shells on the same rooftops, which he intended to combine with one or more of the IEDs.

GANN threw a sixth IED onto the subway tracks on the Williamsburg Bridge, as pictured below.

On or about June 5, 2025, law enforcement agents arrested GANN in SoHo, incident to which they recovered a seventh IED from GANN’s person.  Following GANN’s arrest, GANN falsely told law enforcement, in substance and in part, that he had disposed of the precursor chemicals and the shotgun shells in a dumpster in Manhattan.

In or about May and June 2025, GANN conducted internet searches related to explosives and firearms, including: “will i pass a background check,” “gun background check test,” “can i buy a gun in any state without ffl [federal firearms license],” “3D gun printing,” “gun stores,” “clorine bomb,” “how to make flash powder from household items,” “what to mix with potassium perchlorate to make flash powder,” “alluminum powder,” “black powder nearby,” “quarter stick m1000 firecracker,” “1/2 stick dynamite,” and “rechargeable nail gun to shoot into steal.”

On or about June 5, 2025, just hours before GANN was arrested with an IED on his person, GANN posted to Instagram, “Who wants me to go out to play like no tomorrow?”

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GANN, 55, of Inwood, New York, is charged with one count of attempted destruction of property by means of explosives, which carries a mandatory minimum of five years in prison and a maximum sentence of 20 years in prison; one count of transportation of explosive materials, which carries a maximum sentence of 10 years in prison; and one count of unlawful possession of destructive devices, which also carries a maximum sentence of 10 years in prison.

The minimum and maximum potential sentences are prescribed by Congress and provided here for informational purposes only, as any sentencing of the defendant will be determined by a judge.

Mr. Clayton praised the outstanding efforts of the New York Joint Terrorism Task Force of the FBI, which consists of investigators and analysts from the FBI, NYPD, and over 50 other federal, state, and local agencies; the Bureau of Alcohol, Tobacco, Firearms and Explosives; the Nassau County Police Department; and the New York Metropolitan Transportation Authority.

This case is being handled by the Office’s National Security and International Narcotics Unit.  Assistant U.S. Attorneys Jonathan L. Bodansky, Michael D. Lockard, and Chelsea L. Scism, and Special Assistant U.S. Attorney Julie Isaacson, are in charge of the prosecution.