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.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.