[SoothingDave]

The title says the mastermind has the hallmarks of an attack.

Titles aren’t this website’s big thing, I take it.

[xzins]

English as a second language?

[amorphous]

Mastermind in this case is used as a verb.

The Mastermind Of The San Bernardino Massacre Has All The Hallmarks Of An ISIS Terrorist Attack

Matermind

verb (used with object)
1. to plan and direct (a usually complex project or activity), especially skillfully:

Geez...