As quoted in:

Cox, Joseph. “‘Dark Overlord’ Hackers Text Death Threats to Students, Then Dump Voicemails From Victims.” Daily Beast. 5 October 2017.

Doug Levin, president of consultancy EdTech Strategies told The Daily Beast in an email, “As schools are increasing their reliance on IT services, they are exposing themselves and their communities to new threats. Designed as they are to target children and families and generate fear, this series of attacks represents a significant evolution of the types of online threats facing schools.”