A brief guide to ISIS
(Image credit: Spencer Platt/Getty Images)

After President Obama authorized limited air strikes in Iraq on Thursday evening, American warplanes today bombed artillery equipment being used by the extremist group ISIS to shell the Kurdish capital of Erbil.

Most Americans had never heard of ISIS until June, when the cash-rich Sunni jihadist group suddenly seized Mosul, Iraq's second largest city, sending tens of thousands of Iraqi government soldiers fleeing, and raising the threat of full-blown civil war in the fragile Mideast nation.

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Ben Frumin

Ben Frumin is the former editor-in-chief of TheWeek.com.