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A chronological and analytical database documenting terrorist incidents, actors, methods and consequences from 1881 to the present.
Short news items an editor has manually checked before publishing — never an unverified automated signal published directly, and not automatically added to the historical archive below. See Methodology for how Flash, automated detection and the archive differ.
Top non-state actors across the full dataset.
Summarized across the full dataset.
Terrorism Portal is a public historical database designed to explore terrorist incidents across time, geography, organizations, methods and consequences. The project begins in 1881 and combines structured open-source records with additional filtering and normalization for public exploration.
The current dataset is assembled from openly reusable sources and then deduplicated, filtered and normalized into a common JSONL structure.
Coverage is uneven across periods and regions. Older incidents are generally less complete, casualty figures may differ between sources, and geocoding is not available for every event. The dataset will continue to be cleaned and expanded.