Rumiyah, ISIS's online magazine, called on attackers to fire-bomb the Texas church First Baptist Dallas, according to Homeland Security Today.

A photo of the church was displayed in the article "Just Terror Tactics," and said the church is "a popular Crusader gathering place waiting to be burned down."

The Middle East Media Research Institute's Jihad and Terrorism Threat Monitor called the photo a "direct and specific threat" in the Homeland Security Today article.

The Rumiyah article said, "Throughout history and until the present day, incendiary attacks have played a significant role in modern and gorilla warfare, as well as in 'lone wolf' terrorism."

Fire attacks take little effort, according to Rumiyah: "The attacks likewise demonstrate that with some simple and readily accessible materials (i.e. flammables), one can easily terrorize an entire nation. This is a quick option for anyone intending to join the just terror campaign."

The Rumiyah article offered some advantages to fire attacks, as well.

"Arson attacks should in no way be belittled," the article read. "They cause great economic destruction and emotional havoc and can be repeated very easily. Even if such attacks do not always result in the killing of the enemies, Allah has promised to reward the mujahid for simply harming and enraging them."

Graeme Wood, a columnist in The Atlantic, said mentioning a specific church as a terror target was "taking things to a new level."

In Wood's book, "The Way of the Strangers: Encounters With the Islamic State," Wood wrote ISIS's top American is from Dallas.