ISIS has been more successful than its predecessor organization, al Qaeda, in drawing Americans to its cause. Whereas al-Qaeda was more reliant on preexisting connections to the region or Islam, an ISIL candidate recruit is more likely to be younger, less educated, and a U.S.-born citizen.

During the first meeting of the Women’s March in November 2016, leaders of the organization endorsed virulent anti-Semitic tropes, claiming that Jews were “leaders of the American slave trade” and “bore a special collective responsibility as exploiters of black and brown people,” Tablet Magazine reported on Monday. The comments about Jews were made by two of the leaders of the Women’s March, Tamika Mallory and Carmen Perez, and were allegedly informed by the teachings of anti-Semitic hate preacher Louis Farrakhan, including his book The Secret Relationship Between Blacks and Jews.

Cherif Chekatt, 29, the suspect in the Tuesday’s Strasbourg terror attack, has a criminal record in France, Germany, and Switzerland, and spent time in German and French jails. French investigators say the suspect was radicalized in prison and was on a watch list.

The fight against terrorism-related content and illegal financing online is speeding up thanks to new platforms that join up different internet-scouring technologies to create a comprehensive picture of terrorist activity. The idea is that when an online tool discovers a fragment of information it can be added to a constellation of millions of others - revealing links that might otherwise have gone undetected or taken much longer to uncover.

The terror tunnels that extend from Lebanon into Israel by Hezbollah were part of the Iranian-backed terrorist group’s strategy to cut off the northern Israeli city of Metulla and start a war, a senior IDF officer said. According to the officer from Israel’s Northern Command, Hezbollah planned to use the tunnels to send forces into Israel and block the entrance to Route 90, cutting Metulla off from the rest of Israel that lies to its south.

For Americans, and for the U.S. government, terrorism is a foreign-linked threat, not a domestic danger. Groups which perpetrate violent acts at home are regarded as criminal groups, and law enforcement agencies treat and investigate them as such. The “terrorism” label is not used. Jason Blazakis, who for many years ran the office at the State Department in charge of terrorist designations, argues that this distinction needs to be changed. He offers a method for designating domestic terrorist groups, and for putting them on par with foreign-linked terrorists.

The Israeli military announced that it had located a terror tunnel, constructed by Hezbollah, that extended 40 meters (131 feet) into Israel, as it launched Operation Northern Shield, a campaign to eliminate the threat of terror tunnels along Israel’s northern border.

Warfare in the future will increasingly be about manipulating perceptions, whether by hostile states or non-state actors, according to terrorism expert Brian Michael Jenkins. The creation of fear and anxiety by terrorists, and foreign meddling in U.S. politics, are components of contemporary conflict. A major challenge facing the U.S. is how to get better at countering foes while strengthening national institutions, and U.S. democracy depends on it, Jenkins said.

Conspiracy theories, rampant in the United States, have an unusual power to motivate people to action. Some conspiracy theories are associated with various right-wing or left-wing ideologies, while others transcend ideology, like those surrounding the 9/11 attacks or the assassination of John F. Kennedy. Under the right circumstances, such theories can motivate people to violence, especially if the conspiracy theories single out specific people or organizations as the villains. Most extremist movements develop or depend on conspiracy theories to some degree. In the United States, extreme right-wing movements have a particularly close relationship to conspiracy theories.