That disturbing scenario was laid out in a report by Europol - Europe's law enforcement agency -- released Monday.
The report, entitled "Changes in modus operandi of Islamic State terrorist attacks," paints a picture of a terror group whose methods keep evolving and whose threat is two fold: Coordinated attacks and lone wolf operatives.
"The Paris attacks, and subsequent investigation, appear to indicate a shift towards a broader strategy of [ISIS] going global, of them specifically attacking France, but also the possibly of attacks against other Member States of the EU in the near future," the report said.
The report details some of the ways ISIS is adapting. Here are some of the key findings:
Soft targets are the most vulnerable
Attacks will be primarily directed at soft targets because of the impact and mass casualties they generate, the report says.
Intelligence also suggests that ISIS has developed a command structure to plan and coordinate "special forces style" operations abroad. This could mean that more Paris-style attacks are currently being planned and prepared, the report says. Read more on edition.cnn.