"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
"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
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
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
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
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