One of the accused in the case involving explosive devices thrown near Gracy Mansion on Monday gave the ISIS salute as he was led in shackles from the police precinct.Amir Balat, 18, was seen holding up his right index finger and smiling at the press while being led away by a police officer and an FBI agent. Balat, dressed in a black T-shirt and beige pants, made the gesture before an officer next to him slapped him on the hand.Balat was arrested on Saturday along with 19-year-old Ibrahim Qayoumi after they threw homemade “Satan’s Mother” bombs at protesters outside the Upper East Side residence of New York Mayor Zohran Mamdani.NYPD Commissioner Jessica Tisch confirmed that Saturday’s incident was being treated as an attempted terrorist attack inspired by ISIS. The pair were expected to face federal charges on Monday.According to police and sources, Balat is accused of lighting and detonating a “Devil’s Mother” improvised homemade explosive at around 12:30 pm on Saturday. Police said the device consisted of a sports drink bottle filled with the volatile explosive material TATP, placed inside a glass jar surrounded by nuts and bolts, and could have been fatal if it had detonated.Law enforcement sources told The Post that Balat used the Arabic phrase “Allahu Akbar” (God is great) after his police interview.Balat, a student in the Neshaminy School District in Pennsylvania, was reportedly recorded saying on a police body camera after his arrest that when someone insults the name of the Prophet Muhammad, “we take action,” a law enforcement source said.According to sources, when asked during a police interview why he carried out the failed attack, Qayoumi reportedly said that he did it for ISIS.Federal law enforcement sources told Fox News correspondent CB Cotton that the two teenagers allegedly made pro-ISIS statements while in police custody and admitted to watching Islamic terrorist propaganda videos.Balat, whose parents are reportedly from Turkey but who became naturalized citizens in 2017, reportedly grew up in a four-bed two-bath home in the Pennsylvania suburb of Langhorne that was worth an estimated $653,000, while his alleged partner lived in a $2.25 million six-bedroom home near the New Jersey border.Following Balat’s arrest, agents were seen raiding his home, reportedly as part of an ongoing “terrorism investigation”.