With the attack on the Iranian parliament and Khomeini’s tomb, ISIS brought the Sunni jihadists’ war to Iran, something al Qaeda has been unwilling to do—or allow.
Thomas Joscelyn is a senior fellow at the Foundation for Defense of Democracies and senior editor of The Long War Journal.
In its latest ploy to undermine NATO, Russia is urging cooperation with the Afghan extremists even as their ties to al Qaeda grow deep.
The Taliban has confirmed that Mullah Omar is dead. Why this spells big trouble for al Qaeda in its fight against ISIS.
Brutal beheading videos attract young militants to ISIS. But the group's leader Abu Bakr al-Baghdadi has struggled to recruit established jihadists.
It seems the F.B.I. have made little progress on why the Tsarnaev brothers bombed the Boston marathon. The mystery deepens: who radicalized Tamerlan Tsarnaev?
Iran's foreign minister paid homage this week to a Hezbollah mastermind and an early mentor of Osama bin Laden whose terror tactics inspired the '98 embassy bombings.
New evidence indicates a strong connection between senior al Qaeda leadership and recent terror activity in Africa, contradicting the conventional wisdom, says Thomas Joscelyn.