U.K. Terror Threat Level Raised To 'Severe'

Video: British PM Explains Why Islamic State Threatens Security Like Never Before

Texas Verifies ISIS Border Threat With Leaked Doc

FBI National Domestic Threat Assessment Omits Islamist Terrorism

‘Significant increase’ in terror chatter as haunting anniversary of 9/11 nears

Putin likens Ukraine's forces to Nazis

Ukraine: 'Pro-Russia militia' eating Russian army food take control of Novoazovsk

Ukraine President: Russian Forces Have Invaded

NATO Imaging Shows Russia Troops Inside Ukraine

Two columns of Russian tanks enter Ukraine

State Dept: Russian Counteroffensive Likely Underway in Ukraine

Ukrainian troops in ‘full, chaotic retreat’ as Putin opens ‘third front’ in stealth war

Syria: Computer reportedly seized from ISIS hideout hints at bio weapons attack

UN: Armed group detains 43 peacekeepers in Syria

UN Report: Islamic State Recruiting Children as Fighters in Syria

IS Fighters Claim They 'Executed' 250 Syrians

U.S. Partnering with Syria’s Assad Against ISIL Will Preserve His Rule

Syria Rebels Seize Golan Heights Crossing

UN report accuses Syria of using chemical weapons eight times in 10 days

Islamist gains prompt U.S. to send arms to Lebanon

U.S. flexes B-2 muscle in show of force on China’s doorstep

Sister of Boston Marathon bombing suspect charged in bomb threat

Yazidis still stranded on Mount Sinjar

Islamic State Relying More on Suicide Squads

ISIS demand $6.6M for release of 26-year-old American woman

ISIS accused of ethnic cleansing massacre; 670 prisoners thought killed in Mosul

A Who's Who of the Good Guys and Bad Guys in the New Jihad

Iron Dome in action: Incredible footage shows Israeli air defence system shooting down 15 rockets simultaneously