ISIS controlled large parts of Syria and Iraq, where they declared a caliphate in June 2014. Over time, they lost most of the land and were defeated in Iraq in 2017 and two years later in Syria.

Of the roughly 10,000 adult male detainees accused of fighting for ISIS, about 5,000 are Syrian; 3,000 are Iraqi; and 2,000 come from some 60 other countries, officials said.

The Syrian military and the U.S.-backed Syrian Democratic Forces have announced sweeping gains against the Islamic State militant group (ISIS) in the last of its major hideouts in eastern ...

BEIRUT -- Even as internationally backed forces chip away at ISIS-held territory in Syria, Iraq and Libya, the militants have demonstrated a stubborn resilience this week in the face of recent ...