Khan began posting on social media and communicating on an encrypted messaging app about his support for ISIS last November, the complaint said. He then began communicating with two undercover law enforcement officers, allegedly telling them about a "coordinated assault" using AR-style rifles to "target Israeli Jewish chabads."

MORE: Taylor Swift shows in Vienna canceled after 2 arrested for planning ISIS-inspired terror plot

Khan allegedly told the undercovers Oct. 7 and Oct. 11 "are the best days for targeting Jews."

Oct. 7 marks the first anniversary of the Hamas attack on Israel and Oct. 11 is Yom Kippur, which is the holiest day of the year in Judaism.

Khan boasted that "New York is perfect to target jews" because it has the "largest Jewish population In america" and therefore, "even if we dont attack a[n] Event[,] we could rack up easily a lot of jews."

Khan proclaimed that "we are going to nyc to slaughter them," and sent a photograph of the specific area inside of a location where he planned to carry out the attack, according to the criminal complaint.

/

Khan is charged with one count of attempting to provide material support and resources to a designated foreign terrorist organization. If convicted, he faces a maximum sentence of 20 years in prison."