Western Europe’s burgeoning Islamic population continues to spark concerns about Muslim assimilation and a cultural divide.

Ayman al-Zawahiri, now America’s most wanted terrorist, took over as the head of al-Qaeda in June 2011 after the killing of erstwhile head Osama bin Laden.

Violent acts by homegrown militant extremists in the U.S. have declined, but "lone wolf" attacks are on the rise. The post-9/11 legal and political landscape poses new challenges to law enforcement a…

This publication is now archived. A Condensed HistorySomalia was created in 1960 by the merger of British Somaliland Protectorate and the colony of Italian Somaliland. The United Republic of Somalia …

Financial pressures have weakened al-Qaeda’s tactical abilities, but analysts say affiliated networks are finding new ways to raise and spend money, complicating efforts to squeeze a savvy foe.