ISIS ISIS

The Great Mosque of al-Nuri in Mosul, with its tall, leaning al-Hadba minaret, was where ISIS leader Abu Bakr al-Baghdadi declared the group's "caliphate" in Iraq and Syria in July 2014. Ahmad al-Rubaye/AFP/Getty Images hide caption

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Ahmad al-Rubaye/AFP/Getty Images

Iraqis inspect the damage in Mosul's al-Jadida area on March 26, one week after a U.S. airstrike in the same area killed more than 100 civilians. Ahmad al-Rubaye/AFP/Getty Images hide caption

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Ahmad al-Rubaye/AFP/Getty Images

Pentagon Blames 105 Civilian Deaths From Mosul Strike On 'Secondary Explosion'

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A defaced Islamic State flag is emblazoned on a wall in Tikrit, Iraq, in 2015. ISIS will generally claim responsibility for an attack within one day, though it can sometimes take longer. Mohammed Sawaf/AFP/Getty Images hide caption

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Mohammed Sawaf/AFP/Getty Images

What Does It Mean When ISIS Claims Responsibility For An Attack?

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A pilot prepares to launch an unmanned aerial vehicle from a ground control station earlier this year. The Air Force is moving to treat psychological stress faced by remote pilots and analysts a little more like the effects of traditional warfare. John Moore/Getty Images hide caption

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John Moore/Getty Images

The Warfare May Be Remote But The Trauma Is Real

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Iraqi civilians evacuated from fighting in Mosul hand their IDs to a member of Iraqi special forces to check if they're on a list of suspected ISIS members. U.S.-backed Iraqi forces have been fighting ISIS in the city for six months and more than 300,000 civilians are still trapped by the fighting. Jane Arraf/NPR hide caption

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Jane Arraf/NPR

As Iraqi Forces Encircle Mosul, ISIS Unleashes New Level Of Brutality On Civilians

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A photo provided by Eglin Air Force Base shows the GBU-43/B Massive Ordnance Air Blast bomb. The Pentagon says U.S. forces in Afghanistan dropped the military's most powerful non-nuclear bomb on an Islamic State target on Thursday, the first-ever combat use of the weapon. Eglin Air Force Base/AP hide caption

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Eglin Air Force Base/AP

The Marines will join the approximately 500 U.S. troops already in Syria, such as these U.S. forces on the western outskirts of the northern Syrian city of Manbij on Sunday. Delil Souleiman /AFP/Getty Images hide caption

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Delil Souleiman /AFP/Getty Images

Burned, twisted metal from motorcycles covered an area where a suicide attacker blew up his small pickup truck outside a security office on Friday in the village of Sousian in northern Syria. AP hide caption

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AP

An airstrike targeting an Islamic State group cash and finance distribution center near Mosul, Iraq, as shown in a video released by the U.S. military. AP hide caption

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AP

New Report Finds ISIS Territorial Defeats Are Also Hitting The Group's Wallet

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Defense Secretary Jim Mattis seems to be aiming to reassure U.S. allies while overseas. Ahead of an unannounced visit to Iraq, Mattis rejected President Trump's statements that the U.S. should have seized Iraqi oil after the invasion. Susan Walsh/AP hide caption

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Susan Walsh/AP

Soldiers from the 36th Infantry Division deployed to Afghanistan to help train and advise that country's military. The top U.S. commander in Afghanistan says thousands more such troops are needed there. Maj. Randall Stillinger/U.S. Army hide caption

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Maj. Randall Stillinger/U.S. Army

A 2015 photo shows the Tetrapylon (Monumental Entrance), which was reconstructed after 1963 by the Directorate of Antiquities of Syria, in the ancient oasis city of Palmyra. The ancient structure has reportedly been destroyed by ISIS. Joseph Eid/AFP/Getty Images hide caption

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Joseph Eid/AFP/Getty Images

The Pentagon says many of the ISIS fighters targeted in Wednesday's strike escaped from the former ISIS stronghold of Sirte, shown here during fighting in September. Manu Brabo/AP hide caption

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Manu Brabo/AP

A man adjusts a victim's photograph displayed with floral tributes and Turkish flags outside the Reina nightclub following the attack in Istanbul earlier this month. Emrah Gurel/AP hide caption

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Emrah Gurel/AP

Flowers and pictures of victims have been laid in front of the Reina nightclub earlier this month after the deadly attack. Ozan Kose /AFP/Getty Images hide caption

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Ozan Kose /AFP/Getty Images