"Estimates from some intelligence services indicate several dozen people directed by IS may be currently present in Europe with a capability to commit terrorist attacks," according to the report, which draws on counterterrorism intelligence from around Europe and also cites media reports and previously publicised calls by IS leaders for attacks.
But IS also is adept at inspiring marginalized youths, some of whom may have mental health problems, and inciting them to carry out attacks.
Europol also notes a shift in attacks from symbolic targets like police officers and military personnel to indiscriminate attacks on soft targets, such as the Paris attacks in 2015.
"Indiscriminate attacks have a very powerful effect on the public in general, which is one of the main goals of terrorism: to seriously intimidate a population," the report says, adding that the focus on so-called soft targets means that attacking critical infrastructure like power grids and nuclear facilities is "currently not a priority."
Meanwhile, a police raid in Morocco in February may have thwarted a possible attack by an IS cell using chemical or biological weapons, raising the specter that such weapons also could be used in Europe, though the report says automatic firearms, knives and vehicles are more easily available and that "The effectiveness, ease of use and access of these weapons will continue to be relevant.
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