“The estimates of how many fighters terror groups, such as ISIS, have are always a complex endeavor,” senior director of the Counter Extremism Project, Hans-Jakob Schindler, tells the New York Sun. “One of the key challenges is what is classified as a ‘fighter’. Some governments only estimate the number of individuals that are armed and involved in actual fighting or attacks, while other governments also count all the supporters, including, for example, families.”

Extremist networks linked to ISIS have called for attacks against Hindus in India and across South and Southeast Asia, even as they praised recent violence in the United States and expanded online recruitment, according to a new report by the Counter Extremism Project (CEP), nonprofit and non-partisan international policy organization

Extremist networks linked to ISIS have called for attacks against Hindus in India and across South and Southeast Asia, even as they praised recent violence in the United States and expanded online recruitment, according to a new report by the Counter Extremism Project (CEP).

Counter Extremism Project (CEP) Senior Research Analyst Sofia Koller discusses the foreign terrorist fighter situation and camps in Syria and Iraq. [Starting at 06:29]

[Counter Extremism Project Senior Director] Hans-Jakob Schindler, a former UN Security Council co-ordinator for monitoring ISIS and Al Qaeda, said ISIS has sensed that "this is our opportunity to come back". He said the group's willingness to declare a "new phase" of operations hinted at a boost to manpower after the prison escapes and a push to recruit from Mr Al Shara's ranks.

Some among ISIS' digital support network have even celebrated the current U.S.-Israeli bombardment. The Counter Extremism Project monitor counted a dozen Telegram channels reveling in the news of the battle now consuming much of the Middle East, with one calling on followers to “rejoice in the good news."

Although the proceedings were complex and required considerable resources, they led to a thorough investigation in many places. This includes groundbreaking decisions such as the first conviction of an IS returnee for genocide against the Yazidis (Section 6 of the International Criminal Code (VstGB)). Compared to other European countries, Germany has done a good job here, especially in international criminal law, according to extremism researcher Sofia Koller from the Counter Extremism Project in an interview with LTO.