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Will extremist cells in Europe successfully execute major terrorist attacks against US financial institutions?

Probably not
An attempted attack is plausible, but a successful *major*
medium confidence

Key findings

Based on historical precedent, a successful major attack is a low-probability, high-impact event. The primary analogies are the 19
Strong security infrastructure, degraded operational capacity of extremist networks, and lack of historical precedent for such attacks in recent years.
Hardened targets, degraded cell operational capacity post-2015, robust European CT infrastructure, and the high coordination threshold required for a "major" attack collectively make success unlikely, though insider threats and soft-perimeter vulnerabilities preserve a non-trivial tail risk.

Perspectives

The risk perspectivemedium
Hardened targets, degraded cell operational capacity post-2015, robust European CT infrastructure, and the high coordination threshold required for a "major" attack collectively make success unlikely, though insider threats and soft-perimeter vulnerabilities preserve a non-trivial tail risk.
The historical perspectivemedium
Based on historical precedent, a successful major attack is a low-probability, high-impact event. The primary analogies are the 19
The quantitative perspectivehigh
Strong security infrastructure, degraded operational capacity of extremist networks, and lack of historical precedent for such attacks in recent years.
Moderate agreement
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