By Pervaiz Shallwani, Andrew Grossman and Rebecca Davis O'Brien 

NEW YORK--Three Brooklyn men were arrested Wednesday and accused of plotting to join or aid Islamic State in Syria, offering a glimpse into the militant group's recruiting tactics--and how U.S. counterterrorism officials are fighting back.

The charges in the fast-moving case are part of a concerted effort by U.S. law enforcement to prevent Americans from joining extremist groups in the Mideast or acting on their behalf in the U.S. Top law-enforcement officials have cited threats from Islamic State as among the biggest risks to U.S. national security in the past several months, moving it to the forefront of law-enforcement and intelligence priorities.

Akhror Saidakhmetov, a 19-year-old citizen of Kazakhstan legally residing in the U.S., was arrested early Wednesday at John F. Kennedy International Airport, where he was attempting to board a flight to Istanbul. Another man, Abdurasul Hasanovich Juraboev, 24, was arrested in Brooklyn. The third man, Abror Habibov, 30, a citizen of Uzbekistan like Mr. Juraboev, was arrested in Jacksonville, Fla.

All three are charged with attempting and conspiring to provide material support to Islamic State, also referred to as ISIS or ISIL. Mr. Juraboev, also a legal U.S. resident, and Mr. Saidakhmetov appeared in federal court in Brooklyn on Wednesday. Mr. Habibov, whom police said has overstayed his visa, appeared in federal court in Jacksonville on Wednesday. If convicted, each faces as much as 15 years in prison.

Adam Perlmutter, court-appointed counsel to Mr. Saidakhmetov, said his client was interrogated without an attorney. Mr. Perlmutter also criticized the government's use of confidential informants. Attorneys for Messrs. Juraboev and Habibov couldn't be reached.

The U.S. moves are part of a global effort to deprive Islamic State of support. European countries have sought to stem the flow of nationals going to Syria, but more than 3,000 European Union citizens have traveled to Syria since 2012, EU officials have said. Some who came back have been arrested and charged with terrorism for fighting alongside Islamic State and al Qaeda affiliates.

The investigation into the Brooklyn men began after Mr. Juraboev in August posted to an Uzbek-language website that called for visitors to join Islamic State, according to the criminal complaint.

Using an alias, he pledged allegiance to ISIS and offered to carry out attacks on U.S. soil, including attempting to kill President Barack Obama and serve as a martyr by being shot in return, the complaint said. "That will strike fear in the hearts of infidels," he wrote.

Federal agents visited him about a week later in Brooklyn, where he acknowledged writing the message and told them that he wanted to travel to Syria to join Islamic State, the complaint said. During a follow-up interview with federal agents, he reiterated his intention and added that he would bomb the amusement park at Coney Island in Brooklyn if ordered to do so by Islamic State, the complaint said.

He then continued to make postings, contacting alleged ISIS officials in an effort to go to Syria while writing that if he couldn't, he would attempt attacks in the U.S. on their behalf, the complaint said.

The head of the Federal Bureau of Investigation's New York office, Diego Rodriguez, said not arresting the men at the time was normal protocol, part of an effort by authorities to identify their alleged network.

"That's why we let this play out as much as we could," he said.

The FBI has poured resources into monitoring social-media traffic and web forums used by groups like Islamic State. The agency and others hope to identify sympathizers before they act, then use informants to work alongside, often arresting them as they board flights.

Authorities said that in his interviews with agents, Mr. Juraboev identified Mr. Saidakhmetov as a friend and co-worker who shared his views.

Mr. Saidakhmetov expressed an intent to buy a machine gun and shoot police officers and FBI agents if thwarted in his plan to join Islamic State in Syria, authorities said.

Mr. Habibov helped the others organize and finance their trips, New York City Police Commissioner William Bratton said at a news conference Wednesday. The other two men indicated that they would seek to acquire weapons and attack U.S. police officers if they couldn't make it to Syria, Mr. Bratton said. "Those aspirations were made quite clear by their statements."

The arrests are the latest to fuel concerns among law-enforcement officials that Americans and other Westerners are trying to join extremist groups after being lured by online propaganda.

"This is real," Mr. Bratton said. "This is the concern about the lone wolf inspired to act without ever going to the Mideast--or the concern of once they get to the Mideast, acquiring fighting-skills capabilities and then attempting to return to the country."

Department of Homeland Security officials have made outreach to Muslim communities a priority, hoping to persuade them to alert law enforcement to signs of radicalization. The complaint against the Brooklyn men shows the power of that approach: One suspect allegedly told a cooperating informant he wanted to travel to Syria but couldn't because his mother had grown suspicious and had confiscated his passport.

FBI efforts to prevent Americans from joining Islamic State have resulted in a string of arrests in the past several months. This month alone, seven individuals have been charged in Minneapolis and St. Louis. Other charges have been brought against people in Colorado, Illinois and upstate New York.

While law enforcement officials often lament the power of online propaganda to spur Westerners to support extremist groups, the Brooklyn case demonstrates such reliance on the Internet has major drawbacks for would-be terrorists. The FBI was able to detect and monitor the men's statements because they were active online.

Mr. Bratton said the number of cases being investigated in New York and nationally "nowhere near approach the scale" of those in Europe. In a speech earlier Wednesday, FBI Director James Comey said the agency has open investigations of "people in various stages of radicalizing" in all 50 states.

They are drawn, he said, by Islamic State social-media messages that beckon them to Syria, or barring that, "kill somebody where you are."

Write to Pervaiz Shallwani at pervaiz.shallwani@wsj.com and Andrew Grossman at andrew.grossman@wsj.com

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