The Army will send 1,500 paratroopers from the 1st Brigade Combat Team, 82nd Airborne Division to "train, advise and assist" in Afghanistan.
Militants disguised themselves as Iraqi security forces to gain the trust of civilians and soldiers before executing them.
The U.S. approved $295.6 million in military assistance for Kurdish peshmerga units in Iraq as they prepare for a joint anti-ISIS offensive with allied Shiite Muslim militias.
The Islamic State militant group launched two poison gas attacks on Iraqi troops in two days as pro-government forces advanced against the jihadists in their final Iraqi stronghold of Mosul.
The U.S. military's biggest conventional bomb may have struck the Islamic State group in Afghanistan, but it missed the target on stopping the Taliban takeover.
The U.S. denied Syrian army reports that a Washington-led coalition struck a cache of toxic substances used by the Islamic State group, killing "hundreds."
The suspect identified as the driver of a truck that killed four people had expressed sympathy with the Islamic State militant group.
Militants attacked a base with an explosive-laden vehicle and also targeted a convoy of rebel fighters.
No group has yet claimed responsibility but the Islamic State has stepped up attacks against Christians in Egypt.
The Islamic State group released its first ever official comments on President Donald Trump, referring to him as an "idiot who does not know what Syria or Iraq or Islam is."
"Our forecast for 2017 is that the threat in this region will grow because of the creation of an IS nucleus in the southern Philippines," defense expert Rohan Gunaratna said.
Turkish President Recep Tayyip Erdogan said "Operation Euphrates Shield" was over, but Ankara had "good surprises" in store for the Islamic State group and Kurdish militants in Syria and Turkey.
The aircraft crashed over a residential area as it returned from bombing raids over Derna.
After claiming responsibility for last week's deadly attack in London, the Islamic State group and its supporters have taken to social media to call for more violence.
Khalil Abu Rayan apologized for threatening to shoot up a church, murder a police officer and "skin people like sheep," saying he was an embarrassment to Islam.
U.S. military advisers have begun dressing like their Iraqi counterterrorism allies in order to blend in and better coordinate with local forces fighting the Islamic State group in Mosul.