Just after 1 p.m., when President Trump ended his speech to protesters in Washington by calling for them to march on Congress, hundreds of echoing calls to storm the building were made by his supporters online.

On social media sites used by the far-right, such as Gab and Parler, directions on which streets to take to avoid the police and which tools to bring to help pry open doors were exchanged in comments. At least a dozen people posted about carrying guns into the halls of Congress.

Calls for violence against members of Congress and for pro-Trump movements to retake the Capitol building have been circulating online for months. Bolstered by Mr. Trump, who has courted fringe movements like QAnon and the Proud Boys, groups have openly organized on social media networks and recruited others to their cause.

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