Little is known about the Khorasan group, though it is said to be a small, elite group of Al Qaeda members involved in planning high-level attacks on the US.
The humanitarian crisis is deepening and the chances of a political solution soon seem very slim.
While the jihadis of the Islamic State hope their reputation for brutality will deter their enemies, another group's snuff video shows that what has happened instead is an expansion of viciousness and cruelty.
Overlap with such forces shouldn't be a surprise: America's wars in Iraq have required painful compromises all along.
Al Awri al-Harzi, a Benghazi suspect described as a mid-level Islamic State operative, was killed in a drone strike June 15 while driving a car in Mosul, the Pentagon said.
Gen. Ray Odierno said in an interview aired today that a massive US military effort in Iraq would defeat the Islamic State – and leave them hanging unless Iraqi politicians changed course.
There are troubling signs that training efforts in Iraq haven't been going well. And a lack of US manpower doesn't appear to be the reason.
The recent fall of Ramadi to Islamic State has added to the urgency to shore up Iraq's faltering security forces in Sunni provinces. The US deployment plan is expected to be unveiled Wednesday.
America has been groping for a successful strategy in Iraq for more than a decade, but the realities on the ground keep getting in the way.
Iraq's largest northern city was invaded a year ago by Islamic State militants. Today, its repressive rule is intact, and the group is pushing outwards from its territory in Iraq and Syria.
'Boat season' is in full swing in the Mediterranean, as migrants brave perilous conditions for a better life in Europe. But the crossing is deadlier than ever – already 1,800-plus migrants have died.
This week's round-up of global commentary for the June 1, 2015, weekly magazine.
With the fall of Ramadi, the 'new' Iraqi Army continues to crumble. In its place sectarian militias are coming to the fore.
Iraq and the United States continued to spar over Iraqi forces' willingness to confront Islamic State militants, while Iran weighed in with sharp criticism of the US effort in the fight.
Baghdad's war against the Islamic State does not appear to be going as well as US officials have led many to believe.
In a major blow to Iraqi forces and the US, Islamic State fighters captured the provincial capital of Ramadi over the weekend in fighting that killed about 500 people.
A round-up of global commentary for the May 18, 2015 weekly magazine.
'Two soldiers of the caliphate' attacked the Muhammad cartoon contest in Texas, Islamic State said. But officials say the IS role more likely was inspirational.
US warplanes were part of an action to defend the oil refining city of Baiji from the group yesterday. Today, a major IS offensive is underway in Anbar Province.
Many who were involved in the US war effort in Iraq continue to insist that the country fell apart because of Obama's failings. There is little evidence to support them.