rioters who are members of militias and extremist groups as part of their investigation. Ms. Sanborn testified that few of the 257 rioters arrested so far were being investigated by the F.B.I. before the attack.

“I can only recall from my memory one of the individuals that was under investigation prior,” she said.

The testimony came as the Capitol Police said they were increasing security this week on Capitol Hill, warning of “potential threats toward members of Congress or toward the Capitol complex.”

Testifying at a House hearing, Yogananda D. Pittman, the acting Capitol Police chief, told lawmakers that her agency had received “concerning” intelligence about possible threats against the Capitol for Thursday. But she said the information was law-enforcement sensitive and she would share it only in a closed briefing. She assured committee members that the police force would be ready.

Chief Pittman noted that threats against lawmakers were “through the roof,” rising almost 94 percent the first two months of this year over 2020.

After Jan. 6, the Capitol Police leadership is asking for almost $620 million in total spending, an increase of nearly 21 percent over current levels to pay for new equipment, training and an additional 212 officers for assignments such as a permanent backup force. Chief Pittman also told the lawmakers that she would be working with the architect of the Capitol to design more “physical hardening” of the building after it was overrun by the rioters.

Carl Hulse contributed reporting.

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