Much is still unknown about the motivations of the suspect, who slammed his vehicle into the Capitol's north barricade

The alert of another violent attack on the US Capitol grounds sent shockwaves through Washington, DC, Friday -- shattering the sense of relative calm at the start of the holiday weekend and reminding everyone that a nation just beginning to crawl out from under the pandemic's long shadow is also still under threat nearly three months after the January 6 insurrection.

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