The device, a jar filled with nuts, ‌bolts and screws and wrapped in black tape with a fuse, was thrown by a counterprotester on Saturday outside Gracie Mansion, but it extinguished itself before any explosion, according to a statement from New York ​City Police Commissioner Jessica Tisch. Two people were in custody, Tisch said.

The device was ​one of two that were thrown during the protests, which were led ⁠by two opposing groups, according to police. The second device was still being examined, Tisch ​said.

Far-right activist Jake Lang led a protest on Saturday outside Gracie Mansion - where Mamdani lives ​with his wife - against a purported Islamic “takeover” of New York City and against public prayer by Muslims. Tisch said at a press conference on Saturday that she did not believe Mamdani and his wife were home ​at the time.

In a statement on Sunday, Mamdani condemned Lang’s protest but said the violence ​that followed it was more disturbing.

“Violence at a protest is never acceptable,” Mamdani said. “The attempt to use ‌an explosive ⁠device and hurt others is not only criminal, but it is also reprehensible and the antithesis of who we are.”

Lang’s protest, which consisted of about 20 people, was opposed by a far larger counterprotest of 125 people aimed at running “Nazis” out of New York, Tisch said at a ​press conference on Saturday. ​Police said Emir ⁠Balat, 18, was among the counterprotesters before he lit and threw the device.

The device rolled near police before it extinguished itself, Tisch said ​on Saturday. Balat ran after throwing it and eventually lit and dropped ​a second ⁠device in the street, according to Tisch.

Balat and another man, whom police on Sunday identified as Ibrahim Kayumi, were arrested at the scene, Tisch said. New York police are working with the ⁠FBI and ​the U.S. Department of Justice on the investigation.

Tisch said ​on Saturday there was no immediate indication the incident was related to the U.S. attack on Iran, but that authorities ​were still investigating.