There are plea deals in the alleged plot by four people from Greece to bomb a Muslim community near Binghamton.
Vincent Vetromile has pleaded guilty to first degree attempted criminal possession of a weapon as a crime of terrorism.
He will be sentenced to 7 to 12 years in state prison.
And co-defendants Brian Colaneri and Andrew Crysel pleaded guilty to second degree conspiracy as a crime of terrorism.
The fourth defendant, Nicholas Pheilshifter, is facing charges as a juvenile.