People who stormed the Capitol were radicalized by what they consumed online and in social media. That should sound familiar: Ten years ago, ISIS used a similar strategy to lure Americans to Syria.

Dina Temple-Raston reports on the pattern of radicalization. Tom Dreisbach explores familiar warning signs in the past of one Capitol siege suspect — including hateful speech and violent rhetoric.

More reporting from the NPR Investigations team is here.

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