A device ignited outside Gracie Mansion during a clash between opposing protest groups Saturday was an improvised explosive capable of causing “serious injury or death,” the NYPD said Sunday.

An anti-Islam protest organized by right-wing influencer and pardoned January 6 rioter Jake Lang drew roughly 20 participants, while a counter-protest called “Drive the Nazis Out of New York” peaked at about 125 people

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The two groups were separated into designated protest areas by NYPD officers, but tensions escalated shortly before noon. At around 12:15 p.m., a protester associated with Lang’s group used pepper spray against counterprotesters

About 20 minutes later, an 18-year-old counterprotester “lit and threw an ignited device toward the protest area,” which landed on a crosswalk

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The man then ran southbound to retrieve a second device from a 19-year-old man before lighting it and starting to run, Tisch said. He dropped the second device on a street, and officers secured the area, taking both men into custody.