A far right anti-Muslim group clashed with counter-protesters near Gracie Mansion on Saturday, and the discovery of two suspicious devices brought in the Bomb Squad and sent people running in the streets.

Two devices thrown outside New York City mayor’s residence on Saturday contained explosive materials and fragmentation that could have killed and maimed numerous people, the FBI confirmed late Sunday. A federal terrorism investigation is underway and terrorism charges are pending. Two people from Pennsylvania were arrested outside Gracie Mansion, which is the home of Mayor Zohran Mamdani and his wife, on Saturday afternoon, after a suspicious device was ignited.

New York City Police Commissioner Jessica Tisch told reporters on Saturday that an anti-Islam protest was organized by people associated with Jake Lang, a pardoned Jan. 6 rioter and far-right influencer. A group of counter-protesters, numbering more than 100, also gathered, and two young men from Pennsylvania, angered by the anti-Islam protest, brought the homemade bombs to the gathering, intending to cause harm, law enforcement sources told CBS News.