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Ryan Mauro, national security analyst for the Clarion Project, sums up the top five non-Islamic State (ISIS) terror threats for the coming calendar year, in answer to a query from Fox and Friends.

Most tellingly, four of the five threats on the list are Islamic. Number 5 on the Clarion Project list sums up all the non-Islamic threats under the broad category of "non-Islamic terrorism." In the past 15 years, the number of non-Islamic terrorist attacks committed inside the United States is 19 – about the same number of Islamic attacks committed in Israel in just over a week these days.

Number 4 on the list includes the unrest and various threats emanating from Afghanistan and Pakistan. At least 15 different terrorist groups are active there, including the well-known Taliban and Al Qaeda, as well as the less well-known Haqqani Network, Jaish-e-Mohammed, and more.

An entire country is third on the list of terror threats to watch out for in 2016: Iran.

"The Iranian regime has increased its funding to Hezbollah and Hamas," writes Mauro, while "Iranian-backed militias are vowing to strike Saudi Arabia and launch attacks on U.S. troops in Iraq. And all of this is before Iran has begun really reaping the benefits of the nuclear deal. Next year could see an Iran on steroids and a West that finds itself disarmed of important options to deter Iran's jihad."

Second on the list are some 65,000 jihadists in Syria – currently known as Syrian rebels, but who are actually Islamist extremists who want to implement sharia governance.

And the top terrorist threat for 2016, according to Clarion Project, is an unknown: whichever group succeeds ISIS.

Assuming that "everything goes our way and ISIS's ranks deplete due to casualties and defeats," Mauro writes, it still doesn't mean that ISIS ideology will disappear – and any one or more of several known or unknown Islamic terrorist groups could take its place, with the same murderous ideology.

"We know that ISIS will have a successor as long as the foundational Islamism exists as a mainstream ideology," Mauro concludes pessimistically, "and this 'known unknown' threat is the hardest one to prepare for."