Islamic State in Iraq and the Levant (ISIL)

"ISIL gunmen then yelled insults at the remaining prisoners, lined them up in four rows, ordered them to kneel and opened fire"

Russia urged Western and Arab nations to overcome their distaste of the government in Damascus and engage with it to fight the hardline insurgents

MI5 and MI6 have been utilizing voice recognition technology to identify the IS member

The advance of Islamic State through northern Iraq has alarmed the Baghdad government and its Western allies, prompting the first U.S. air strikes

Extending military action to Syria is the only way to defeat IS, says chairman of the joint chiefs of staff

Details emerge about 'The Beatles,' the British jihadists in charge of Western Islamic State hostages

The killer is believed to be a Londoner, one of three British Islamic State captors known as The Beatles.

The Islamic State released a video on Tuesday that gave the strongest indication yet it might attempt to strike American targets.

"The failure of the Mosul Dam could threaten the lives of large numbers of civilians," the White House said.

The Iranian-backed Hezbollah has been helping Syrian President Bashar al-Assad fight a Sunni Islamist-dominated insurgency

The ancient community of Yezidis faces a life of permanent exile unless the Islamic State is defeated

Several U.S. officials, speaking on condition of anonymity, said a decision to send at least 70 extra military personnel to Iraq was likely later in the day

There is "no American military solution to larger Iraq crisis," President Obama warned

The U.S. supports the new premier, but Maliki says he isn't going anywhere

The ally Obama needs to defeat the Islamic State in Iraq is losing friends fast

The Obama administration has congratulated a former Maliki lieutenant who was named by President Fouad Masoum to replace him

Obama said U.S. airstrikes have destroyed arms and equipment that Islamic State insurgents could have used to attack Arbil but warned the current operation in Iraq could take some time

ISIS have captured the dam, three towns and an oilfield in recent days, reports say

In the city of Raqqa, ISIS has deployed a unique unit of female morality police

The group set a Saturday deadline for Christians who did not want to stay and live under those terms to "leave the borders of the Islamic Caliphate"

The dead included Saddam-era army colonel Hussein al-Mehdawi, who was fighting alongside the Islamic State, and six of his relatives

Out with big battle battalions; in with sly, asymmetric, unending warfare

Experts say the insurgents will wage war on the capital from the "Baghdad belt" of towns circling the city

Iraq's government is unable to fulfill its international obligations to destroy toxins kept at the facility, the country's U.N. envoy told the United Nations

The militant group is ramping up efforts to implement its extreme religious agenda

A recent string of victories and a slick online presence appeal to a new generation of extremists

Iraq's military was "capable of defending Baghdad" but it "would be challenged to go on the offense," General Martin Dempsey said

Iraqis speak of a "Zero Hour" as the moment a previously-prepared attack plan would start to unfold

The same militant group attacking Iraq wants a Sharia-based Caliphate with pieces of Jordan

The Syrian Observatory for Human Rights said clashes between rival Islamist groups in Syria had killed around 7,000 people since January