The lit device thrown during a clash of protests outside Gracie Mansion, the official residence of Mayor Zohran Mamdani, was in fact an “improvised explosive device,” NYPD Commissioner Jessica Tisch said Sunday.

The NYPD said the device thrown outside Mayor Zohran Mamdani's residence was an "improvised explosive device" capable of causing serious harm.

The teen was seen holding up his right index finger -- a universal salute for the terror group -- and grinning at press while being led by a cop and an FBI agent.

A device deployed during dueling demonstrations outside Grace Mansion in New York City on Saturday has been found to be an improvised explosive device, according to the NYPD.

Two teens accused of trying to ignite homemade explosive devices at a protest outside Gracie Mansion over the weekend expressed support for ISIS after their arrest, according to a criminal complaint released Monday.

Mamdani condemned Jake Lang's "white supremacist" rally and explosive devices found at Gracie Mansion, that resulted in arrests.

A D.C. man is facing federal charges after investigators say he set off an explosive device inside a Northeast D.C. apartment. A woman who was injured in the blast was taken to a nearby hospital, where investigators say they found shrapnel in her arm.

A device found outside of Gracie Mansion on Saturday during dueling protests in New York City was confirmed to be an improvised explosive device, according to police