NEW YORK (AP) — Two men who brought explosives to a protest outside New York City's mayoral mansion said they were inspired by the Islamic State extremist group, a court complaint said.

Emir Balat and Ibrahim Kayumi are awaiting arraignment Monday on charges of attempting to provide material support to a terrorist organization and using a weapon of mass destruction.

Kayumi blurted out, as he was being arrested Saturday, that “ISIS” was the reason for his conduct, the complaint said. Balat, 18, later told authorities that he had pledged allegiance to the extremist group, and Kayumi, 19, asserted that he was affiliated with the Islamic State group, the complaint said.

Officers asked Balat whether he was aiming to accomplish something akin to the bombing of the Boston Marathon in 2013, when two pressure-cooker bombs exploded near the finish line, killing three people and wounding hundreds more.

“No, even bigger,” Balat replied, according to the complaint.

The men's attorneys were expected at court. Attempts to reach the suspects' families were not immediately successful. The two men both have addresses in Pennsylvania, and Balat carried a Turkish government identification card along with his Pennsylvania driver’s license, according to the complaint.

An automated license plate reader captured the pair entering New York City from New Jersey less than an hour before the attack, according to the complaint.

Their vehicle — registered to one of Balat’s relatives — was discovered Sunday a few blocks from where they were arrested. A search of the car turned up a “hobby fuse” and a metal can, along with a written list of chemical ingredients and components that could be used to build explosives, the complaint said.

The homemade devices, which did not explode, were hurled Saturday during raucous counterprotests against an anti-Islamic demonstration led by Jake Lang, a far-right activist and critic of New York Mayor Zohran Mamdani, a Democrat and the first Muslim to hold the office. Mamdani and his wife weren't at the house, called Gracie Mansion, at the time.

Speaking outside the residence Monday morning, Mamdani said Balat and Kayumi “traveled from Pennsylvania and attempted to bring violence to New York City.”

Police Commissioner Jessica Tisch said there are no indications that the men’s alleged activities were connected to the ongoing war in Iran. She declined to say more about why authorities believe the suspects were motivated by the Islamic State group, a Sunni extremist group. Iran’s population is almost entirely Shiite, the other main religious community within Islam.

While Mamdani and Tisch briefed reporters Monday, Lang heckled from outside the Gracie Mansion gates.

Meanwhile, police searched a home in northeastern Pennsylvania’s Middletown Township, and a separate federal investigation was underway in nearby Newtown, local police said. Both inquiries were related to the incident outside New York’s mayoral residence, Rep. Brian Fitzpatrick, a Pennsylvania Republican, wrote in a social media post Sunday.

Lang's sparsely attended protest Saturday drew a far larger group of counterdemonstrators, including one person who police say tossed a smoking object containing nuts, bolts, screws and a “hobby fuse” into the crowd.

The device extinguished itself steps from police officers, Tisch noted. The same person who threw it then dropped a second device that did not appear to ignite, the commissioner said.

The scene had grown chaotic even before the devices were thrown. Police said one person involved in the anti-Islam protest, Ian McGinnis, 21, was arrested after pepper-spraying counterprotesters. McGinnis, of Philadelphia, was released without bond after pleading not guilty Sunday to assault and aggravated harassment in a New York court, records show. A message seeking comment was left Monday for his attorney.

Three others were taken into custody but were released without charges.

After the Jan. 6 insurrection at the U.S. Capitol, Lang was charged with assaulting an officer with a baseball bat, civil disorder and other crimes. He was later freed from prison as part of President Donald Trump’s sweeping act of clemency. Lang recently announced that he is running for U.S. Senate in Florida.

Earlier this year, he organized a rally in Minneapolis in support of Trump’s immigration crackdown, drawing an angry crowd of counterprotesters who quickly chased him away.

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This story has been corrected to reflect that police are now identifying one of the suspects by the name Ibrahim Kayumi, instead of Ibrahim Nikks. Earlier headlines were corrected to show Tisch referred to the possibility of the suspects being inspired by rather than related to the Islamic State group.

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Associated Press writers Jennifer Peltz in New York and David Collins in Hartford, Connecticut, contributed.