Bangladesh, June 5 -- Europe is awaiting unusual and unpredictable jihadist threats that are not only linked to specific organizations, but are also based on local jihad activity originating from within. In addition, European fighters who were in Syria and Iraq later returned to their country. This exacerbates the problem of the presence of internal and sleeper cells in Europe.

In spite of Islamic State's defeat in Syria and Iraq, European security officials are feeling anxious. The defeat of the terrorist organizations in the Middle East means that imminent future problems will occur in Europe, given the surrender of the European fighters and their return to their homes. The fighters may have been defeated on the battlefield, but they s...