Two men have been arrested and charged with running an international child exploitation enterprise known as 764 which targets vulnerable minors online and coerces them to self-harm, make child sexual abuse material of themselves and participate in violent acts — including animal abuse and even suicide.

Prasan Nepal, 20, who police say used the moniker “Trippy” in the 764 network, was arrested in North Carolina. Leonidas Varagiannis, a 21-year-old U.S. citizen, known as “War” was arrested in Greece, according to police.

They allegedly led a core subgroup called 764 Inferno that operated using encrypted messaging platforms. Police say the men exploited at least eight minors, some as young as 13 years old.