This pilot study investigates the correlation of online and on-the-ground behaviours of three lone-actor terrorists prior to their intended and planned attacks on soft targets in North America and Europe: the Pittsburgh synagogue shooter, the Buffalo supermarket shooter and the Bratislava bar shooter. The activities were examined with the definition of the proximal warning indicator energy burst from the Terrorist Radicalization Assessment Protocol (TRAP-18), originally defined as an acceleration in frequency or variety of preparatory behaviours related to the target. An extensive quantitative and qualitative assessment of primary and secondary sources was conducted.

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