A profile of the international terrorist network that the United States has singled out as the most serious threat to U.S. security.

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.

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.

A profile of the Algerian terrorist organization, Armed Islamic Group (GIA).