A man was detained Monday morning after fireworks caused an explosion outside a federal building in Lower Manhattan [1], [2], [3].

The incident targeted 26 Federal Plaza, a facility that houses dozens of federal agencies, including U.S. Immigration and Customs Enforcement (ICE) [3]. The attack underscores escalating tensions surrounding federal immigration enforcement and the security of high-profile government installations in New York City.

Authorities said the explosion occurred at approximately 8:20 a.m. [1]. The suspect, described as a male, allegedly used fireworks and fire-crackers to trigger the blast [1], [2], [3].

An NYPD police spokesperson said, "He threatened passers-by, lit a fire and set off fireworks" [2]. Following the blast, the FBI launched an investigation into the incident [1].

A spokesperson for the Department of Homeland Security said the suspect was an "anti-ICE rioter" [1]. The building at 26 Federal Plaza serves as a hub for various government operations in the city [3].

Unnamed sources cited by CBS News said, "The suspect was motivated by anti-ICE sentiments" [3]. The suspect remained in custody following the emergency response in Lower Manhattan [1], [3].

Police and federal agents secured the perimeter of the plaza immediately after the detonation to ensure no further devices were present [1], [2]. No further injuries or casualties were reported in the immediate aftermath of the explosion [2].

"He threatened passers-by, lit a fire and set off fireworks."

This incident highlights the volatility of protests targeting immigration enforcement agencies. By choosing 26 Federal Plaza—a multi-agency hub—the suspect targeted a visible symbol of federal authority. The use of fireworks rather than military-grade explosives suggests a low-sophistication attack, but the timing during the morning commute indicates an intent to cause maximum disruption and public alarm.