NYPD Says TATP Bombs at Gracie Mansion Were Built to Kill, Not Intimidate

Two men from Bucks County brought homemade bombs packed with one of the world's most volatile explosives to demonstrations outside New York City's Gracie Mansion on Saturday, and prosecutors say at least one of them wanted the carnage to exceed that of the Boston Marathon bombing.

Emir Balat, 18, and Ibrahim Kayumi, 19, now face federal terrorism charges after the FBI's Joint Terrorism Task Force, the NYPD, and the U.S. Attorney's Office for the Southern District of New York launched a coordinated investigation. Prosecutors released a criminal complaint describing an ISIS-inspired plot targeting the official residence of Mayor Zohran Mamdani.

NYPD Commissioner Jessica Tisch was unambiguous about the nature of the threat. "These were not hoax devices or smoke bombs," she said Monday. The devices contained triacetone triperoxide, known as TATP, a chemical compound favored by terrorist networks for its accessibility and destructive power, and were made to "injure, maim or worse," Tisch said. CBS reported that the bombs were allegedly ignited but never exploded.

The last time an IED was deployed in New York City was December 2017, when Akayed Ullah detonated a homemade bomb strapped to his torso in a pedestrian underpass connecting the Port Authority Bus Terminal to the Times Square subway station. Tisch cited that incident as the closest parallel.

The precise role of the two suspects within the demonstrations remains under investigation. ABC News reported the devices were deployed at an anti-Muslim protest organized by far-right provocateur Jack Lang, whose event was billed as "Stop the Islamic Takeover of New York City." CBS described the suspects as "ISIS-inspired protesters" who brought the devices to demonstrations and referenced a counterprotest outside Gracie Mansion. Investigators have not publicly resolved the discrepancy.

Two NYPD officers were credited with preventing greater harm. Mayor Mamdani singled out Assistant Chief Aaron Edwards and Sgt. Luis Navarro at a Monday news conference, calling their conduct "courageous and selfless" and saying they "ran towards the danger so that others could run safely."

Mamdani condemned the suspects directly in a statement following the release of the criminal complaint. "They are charged with committing a heinous act of terrorism and proclaiming their allegiance to ISIS," he said. "They should be held fully accountable for their actions. We will continue to keep New Yorkers safe. We will not tolerate terrorism or violence in our city."

The attack has intensified political scrutiny of the first-term mayor, whose relationship with the NYPD was already strained. Many in law enforcement have characterized his support for the department as tepid, a friction CBS News linked to a prior controversy dubbed "Snowball Gate." One source quoted by CBS, identified only as Esposito, said Mamdani "has to work to rebuild trust" but called his response to the bombing attempt "a good step."

The FBI has not publicly disclosed the specific federal statutes under which Balat and Kayumi are charged. Prosecutors have referenced the criminal complaint but have not released further details about the suspects' planning, communications, or how they obtained materials to construct TATP devices.