Crusaders is a term used by Islamists to refer to any Western presence in the Middle East, though it is most often used to refer to the U.S. In addition, anti-Muslim extremists in the United States often... Read more

Green birds references a hadith which states that the souls of martyrs ascend to heaven in the form of green birds. Islamist extremists online often use the term as a coded way of indicating that they intend... Read more

"Khaybar Khaybar ya yahud" is the first verse of an antisemitic chant which references a battle fought in 628 CE in the Khaybar Oasis, in the Hejaz province of modern-day Saudi Arabia. During this battle, the army... Read more

On February 26, 1993, terrorists affiliated with Al Qaeda detonated a 1,336 lbs truck bomb underneath the North Tower of the World Trade Center in lower Manhattan. The bomb was intended to bring down the North Tower... Read more

"Baqiya wa Tatamadad" is an Arabic phrase meaning "remaining and expanding," which became the slogan of the Islamic State after the collapse of the territorial caliphate. ISIS supporters will often add the phrase as a hashtag or... Read more

The Boston Marathon Bombing was a domestic terrorist attack that occurred on April 15, 2013 in Boston, Massachusetts. Dzhokhar and Tamerlan Tsarnaev, two Kyrgyz-American brothers of Chechen descent, created two pressure cooker bombs using instructions published by... Read more

The Charlie Hebdo terror attack occurred on January 7, 2015 in Paris, France, when two brothers forced their way into the offices of the French satirical newspaper Charlie Hebdo and opened fire, killing 12 people and injuring... Read more

Dzhokhar and Tamerlan Tsarnaev were domestic terrorists who committed the Boston Marathon bombing on April 15, 2013. The Kyrgyz-American brothers were radicalized in part by the lectures of Al Qaeda in the Arabian Peninsula's (AQAP) extremist cleric... Read more

The Garland, Texas terrorist plot, also known as the "Draw Mohammed Art Contest" plot, refers to a May 3, 2015 incident in which two men — Elton Simpson and Nadir Soofi — entered the Curtis Culwell Center... Read more

The June 2016 shooting spree at the Pulse nightclub in Orlando, Florida, by Omar Mateen—who killed 49 people and wounded 53 more—dwarfed in its lethality all other extremist-related murders in the decade. Mateen, who claimed his attack... Read more