Turkey on Tuesday issued an arrest warrant for 37 suspects over their alleged links to a network accused of orchestrating a coup attempt in 2016.

The prosecutor’s office in the capital Ankara said in a written statement that the warrant was issued as part of an investigation into the Gulen Movement’s “structuring” in Land Forces Command.

The suspects included two active-duty officers, 28 military students, and two “private imams,” who were accused of communicating with the “civil imams” of the organization using fixed telephone lines.

Dowen College: My son suffered same treatment as late Sylvester Oromoni, parent alleges

The Turkish government has launched a massive crackdown on suspects with links to the network after the coup attempt in 2016.

Ankara says U.S.-based Muslim preacher Fethullah Gulen was behind the coup attempt, in which at least 250 people were killed.