Brian Colaneri, 20, Vincent Vetromile, 19, Andrew Crysel, 18, and an unidentified 16-year-old male were arrested on Friday in Greece, New York. All are accused of making homemade bombs and plotting to attack the Muslim community of Islamberg in Delaware County, New York.
The 16-year-old male is being classified by police as an "adolescent offender" and his name and photograph have not been released.
All four are from the Rochester, New York, area and have each been charged with three felony counts of criminal possession of a weapon and one felony count of conspiracy, according to Greece Police Sgt. Jared Rene. It was not immediately clear whether the accused had retained attorneys.
Greece Chief of Police Patrick Phelan hailed the swift investigation as an example of how teaching kids to "see something, say something" can work.
"This was a nice job by everyone involved. The kids did what they were supposed to do, security did what they were supposed to do. They involved the police very quickly and everything worked. And as a result, nobody's dead. That's a good story, it really is," Phelan said Tuesday.
A plot quickly uncovered
Phelan said the investigation began on Friday after a student overheard the 16-year-old showing a photo of another student and making a comment to the effect of, "he looks like the next school shooter, doesn't he?"
That student reported the comment and school security immediately interviewed the students involved in the conversation. School security also notified Greece Police, who took over the quickly expanding investigation that eventually involved the help of New York State Police, federal law enforcement, and officers from other nearby towns.
After conducting further interviews and executing several search warrants, police found 23 firearms and three "improvised explosive devices" associated with the four males, as well as the alleged plot to attack Islamberg. The devices are being analyzed by the FBI at a lab in Quantico, Virginia, Phelan said.
While police would not give details about what the alleged plot against Islamberg entailed, Phelan said it appeared the plot had been in the works for about a month. Three of the four males knew each other through their participation in Boy Scouts, Phelan said.
The Muslims of America, an organization affiliated with the Islamberg community, did not immediately respond to CNN's request for comment.
A secluded community
Islamberg is a community of several hundred Muslim Americans located about a three-hour drive northwest of New York City.
The police investigation into the men and their plans is ongoing. Phelan said investigators still need to analyze numerous phones and computers seized during their searches, so more charges could be forthcoming.
A preliminary court hearing is scheduled for Wednesday at 11 a.m.