The grainy images show a man wearing a baseball cap, dark sunglasses and a black long-sleeve shirt with an image on it that appears to include, in part, a picture of the American flag.
Kash Patel, the F.B.I. director, said that the agency’s investigation was continuing, reversing his earlier announcement that someone had been apprehended.
Some mayors and police chiefs said they would welcome more traditional law enforcement cooperation with federal agents, but see the National Guard as a step too far.
Crime has fallen since federal agents started policing the streets of Washington in large numbers. Court records show that they have been involved in about a third of arrests that resulted in prosecution, many of them for minor offenses.
Many of the arrests in Washington, D.C., involving federal agents have been for low-level offenses. A man was taken into custody in the Columbia Heights neighborhood Aug. 22 on a charge of smoking marijuana in public.
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