Iraq government forces retook Mosul airport from Islamic State within a week of launching the West Mosul operation.
Gen. Joseph Dunford says the US faces threats from Russia, China, Iran, North Korea and violent extremism.
The strategically vital site controls access to parts of Isis-controlled western Mosul.
The US-backed government forces hope to use the airport as a launchpad for their campaign to expel the jihadists from Mosul.
Garrett Grimsley used an anonymous app to make threats. Hours later, the FBI knocked.
Col. John Dorrian said air strikes by coalition forces have set the conditions for Iraqi forces to retake the Mosul airport.
Tunnels and passageways will allow Isis militants to hide and fight among the civilian population when Iraqi forces launch an attack.
Hashtag praising "the martyr Abu Bakr al-Samaraei" quickly spread on social media.
The zoo in eastern Mosul was once home to a multitude of animals including four lions, but under Islamic State rule, they died of starvation or were killed off.
Syrian Democratic Force fighters now control most of the villages and towns north of Raqqa.
Robert Lorenzo Hester Jr, 25, was caught by FBI agents, posing as Islamic State militants.
NGO accuses western governments of ignoring corruption and allowing Islamic State to thrive across the world.
Abu Zakariya al-Britani thought to be one of 850 Britons to join terror groups in Iraq and Syria.
Islamic State sleeper cells in east Mosul mark the start of a new insurgency.
Iraqi forces are pushing from the south towards Mosul airport.
Federal police and elite interior ministry units known as Rapid Response are leading the charge toward the airport, just south of the city.
Islamic State group has threatened to eliminate Christians from Egypt and 'liberate Cairo'.
Sir Michael Fallon tells Munich security conference about need to stay until 'job is done'.
The billionaire magnate said advances in genetic engineering could be a global threat.
The newly-trained soldiers include nearly 2,000 policemen from Nineveh province.
Kimberley Taylor of Blackburn is first known British woman to join fight against jihadists.
The Sufi shrine bombing in southern Pakistan claimed 72 lives on Thursday.