A series of airstrikes targeting senior ISIS commanders in Iraq has killed scores of militants, including several senior commanders.
Receipts from taxi rides, ledgers listing internet usage and random logbooks are just some of the documents that ISIS militants left behind.
Supported by the United States, the Iraqi-led coalition has recaptured at least 70 percent of eastern Mosul during a months-long battle.
"I was much more afraid of women," Umm Fatma, a 28-year-old mother of three, told NBC News. "The women would beat you for the smallest thing."
If ISIS’ oppressive rule had been unbearable when the group was at its most powerful, it became even worse under its decline.
Two weeks after America began backing Iraqi and Kurdish forces assaulting Mosul, the U.S. has thrown its weight behind an effort to retake Raqqa.
Iraqi children finally get a chance to go back to makeshift classrooms - and sing and play - without fear of ISIS.
Few doubt ISIS will eventually be dislodged from Mosul, but how it is governed afterwards will truly determine whether the operation is a success.
ISIS is about to face a war on two fronts, and it seems unlikely that the group’s self-declared caliphate will survive it.
Raqqa is the de facto capital of the extremists' so-called caliphate which stretches from Syria into Iraq.
American troops are working with their Kurdish and Iraqi Army counterparts to coordinate the massive military operation to oust ISIS from Mosul.
President Tayyip Erdogan is reasserting Turkey's historic territorial claims while also trying to crush Kurdish separatists.
Here's a rundown of who's involved in the Mosul offensive — and what they want.
The Iraqi army, backed by a U.S.-led coalition, is preparing an offensive to take the city back from ISIS.
The international human rights lawyer spoke exclusively to NBC News about her fight for the persecuted people.
ISIS controlled Fallujah from January 2014 to June 2016, when Iraqi troops backed by U.S.-led airstrikes liberated the city. Here's what the militants left behind.
One of three schoolgirls who left their homes in Bethnal Green to join the Islamic State is believed to have been killed by an airstrike in Raqqa, ITV
Michael Enright has swapped walk-on parts in Tom Cruise movies for a role in the YPG advance on the ISIS stronghold of Raqqa.
Western nations have made it harder for citizens to join ISIS in Syria, so some fighters are conducting operations at home.
Was the wave of recent attacks — from Turkey to Bangladesh, Baghdad to Medina — a sign of ISIS strength or weakness?
The Karakal Battalion was founded in 2000 as the country's first to mix male and female soldiers fighting side-by-side.
The 27-year-old New York man tells his story of joining and escaping the terror group.
NBC News' Richard Engel spoke one-on-one with an American who joined the terrorist group, then managed to escape.
The 27-year-old is now in federal custody and cooperating with authorities.
They were from Silicon Valley and suburban Ohio and ended up in Syria.
Teenagers are being turned into "weapons" by ISIS, triggering fears that they could slip back to the West to launch attacks.
Jaffrey Khan, Zakia Nasrin and Rasel Raihan lived in Ohio before joining the terror group.
Among thousands of ISIS recruits listed in the terror group's personnel files, there are names of Americans who've traveled to Syria.
ISIS personnel files obtained by NBC News revealed the identities of 15 Americans who left their country to fight for one of its most dangerous enemies.
ISIS recruitment as plummeted in 2016, and the militant group is struggling to pay fighters as coalition forces target its money.
By his own account, the man, who calls himself "Abu Mohammed," is an accomplice to murder and a thief.
Files on more than 4,000 fighters provide a deeper understanding of who signed up for ISIS.
ISIS leaders on the U.S. kill list have escaped, say critics, because the Obama administration will only let the CIA use its drones for surveillance.
Thousands of documents apparently leaked from inside ISIS paint a detailed picture of the terror group's personnel.
One woman has been battling ISIS for a year on her known as they threaten to wipe out her people: the Yazidis.
“Danger has always been part of my life,” FEMEN leader Inna Shevchenko said.
ISIS started off the year with a bang — but 2015 has been a mixed bag for the terror group. Here's a look at how the year has played out.
Here's a look at how the year has played out for ISIS.
ISIS is transmitting hours of extremist propaganda into homes deep in one of Afghanistan's biggest cities for the first time.
At least one of the 34 countries listed by Saudi Arabia appeared surprised to be included in the group spanning the Middle East, Asia and Africa.
Abu Muhammad al-Adnani is the man behind the terror group's strategy of mass murder around the world.
While Rob Malley has decades of experience in national security, he's a lightning rod who has had his share of controversy concerning the Middle East.
ISIS still holds some 2,000 Yazidi women and girls, according to community leaders. Here some of the survivors and family members speak out.
Yazidi legislator Vian Dahkil is a desperate people’s last and only hope.
For many Yazidi exiles in the U.S., this year's Thanksgiving feast will include a big side of gratitude for their deliverance from ISIS.
One man is fighting to chronicle the death of one of the world’s oldest religions, the Yazidis, at the hands of one of its newest terror groups, ISIS.
Fian Ayub looked like she'd stepped out of the pages of a glossy Western bridal magazine — save for the rubble strewn behind her.
Mohammed Emwazi participated in numerous propaganda videos showing Westerners being beheaded.
The ISIS killer dubbed "Jihadi John" once vowed to achieve fame as a professional soccer player by the age of 30.
"There is no vengeance, but there is accountability," a senior U.S. official told NBC News.
The U.S. airstrike targeting the ISIS fighter nicknamed "Jihadi John" shows the U.S. has sophisticated intelligence and will serve as a morale blow.
The families of Western hostages murdered by ISIS have expressed mixed feelings about news that Mohammed Emwazi was targeted by a U.S. airstrike.
"This is the most important international police operation in Europe in 20 years," Italian anti-terrorism chief Giuseppe Governale said.
The beheading of seven civilians, including women and a child, by ISIS-linked militants in Afghanistan has raised fears that the terror group is tightening its grip.
ISIS seized control of Mosul in 2014.
Egypt's interior ministry said Aly Ashraf Hassanein al Gharabli masterminded the kidnap and murder of American oil worker William Henderson.
Seven civilians, including three women and a child, have been beheaded by suspected ISIS-linked militants in southern Afghanistan.
The double murder achieved its goal. It sent the message that, even here in the relative safety of Turkey, ISIS and its supporters can reach critics.
Raqqa is Being Slaughtered Silently has been documenting ISIS abuses.
The White House was expected to announce the move later Friday.
The rapper — born Denis Cuspert — had performed under the name "Deso Dogg" prior to joining ISIS.
The revelation came a day after U.S. Defense Secretary Ashton Carter said the U.S. may carry out more unilateral ground raids in Iraq to target ISIS militants.
A new video purports to show Thursday's raid in Iraq in which dozens of ISIS hostages were freed and an American commando was killed.
When presidents need to take out a terrorist or rescue hostages in a warzone, they turn to covert military units like Delta Force.
Authorities believe the account was created to lure in current law enforcement officers and collect their personal information.
IHS data showed the vast majority of attacks during the reporting period — just over 83 percent — were in Iraq and Syria.
The feds have arrested the hacker who allegedly gave personal data of government officials to ISIS.
Frustrated by what they see as America's failure to defeat ISIS, some Iraqi civilians want Russia to start bombing on their soil.
The rebel captain blames a lack of trainees and poor salaries for the "train and equip" program's failure.
These days Syrian Bashar al-Assad is so weak Russia and Iran are effectively running Syria.
After years of bringing hope to others, Syria's piano man has fled, his instruments destroyed by ISIS militants.
A video released by ISIS appeared to show more than a dozen of the terror group's fighters undergoing weapons training on American M16 rifles.
Iraqi refugees fleeing ISIS are living in fear swathes of humanitarian health services risked being axed because of a lack of international funding.
The horrific execution tactic is the latest in a string of brutal punishment methods applied by ISIS under its strict interpretation of Islamic — or shariah — law.
American citizen Keith Broomfield, who was killed fighting ISIS, believed it was "God's will" that he go to Syria, his mother told NBC News.
Who exactly is behind the assault on Iraq's key cities? Here's a primer on ISIS, Sunni militants waging a bloody battle to establish an Islamic state.
Just what are the U.S. allies in the region bringing to the fight that “isn’t America’s fight alone”?
While Osama bin Laden launched the 9/11 attacks and helped the Taliban take over Afghanistan, he never controlled a vast territory like ISIS now does.
Last November, real, true contact was made – but the conversation was over almost as soon as it began.
Two boys recount to NBC News their imprisonment and torture at the hands of ISIS.
One Yazidi woman, held captive by ISIS, recalls members of the terrorist organization calling prisoners "infidels" and saying "we will do what we want with you."
Video obtained by NBC News and smuggled out of the ISIS stronghold of Raqqa offers a rare glimpse into life under the militants.
"The more time on target, the better the estimate,” a senior U.S. official told NBC News.
Students from Iraq's University of Baghdad are using their summer break to learn how to fight ISIS.
It simply took a social media account for Mohammad Dakhlallah and his wife, Jaelyn Young, to connect with ISIS militants.
“If I can fight against them with my music, then my song is as powerful as or more powerful than their weapons,” said Helly Luv.
Three women who spoke to NBC News were members of ISIS' morality police. They described life under the terror group's harsh rule in Syria.
Are Russia and Iran set to abandon ally Syrian President Bashar Assad? NBC News' Chief Foreign Correspondent Richard Engel looks at what may happen.
Turkey's leader has offered a simple and resolute explanation for the simultaneous strikes: ISIS are terrorists and the PKK are terrorists.
Fleeing ISIS fighters have laid so many land mines that at least 15 villages around Hasakah, Syria, are now uninhabitable, a Kurdish commander said.
A man who dropped out of college to join ISIS said after being captured becoming a member of the extremist group was the worst decision he's made.
Robert Rose, a single dad from the South Bronx, is one of around 400 foreigners fighting with Kurdish forces against ISIS in Syria. This is his story.
ISIS is all about creating an Islamic state — but to parents of kids who've joined the caliphate, the group's appeal often comes down to cash.
Iraqi Christians driven from their homes by ISIS have formed a militia and are fighting to retake their homeland from the extremists.
A bloody past and centuries of mistrust between two branches of Islam may doom Iraq's bid to crush ISIS.
A video statement issued by ISIS channels in Syria addressed the "tyrants of Hamas" and vowed to uproot the Palestinian organization.
Hundreds of northern Syrians attempt to find refuge in neighboring Turkey after fighting between Kurdish-led militia and Islamic State intensifies. Some 13,000 Syrians have already crossed into Turkey in the past week.
For Haider Oraibi, director of the Iraqi National Museum in Baghdad, the statues and relics being erased from Iraqi history have great significance.
One year after a caliphate was declared spanning Syria and Iraq, there is little to celebrate — unless you're ISIS.