By Jana Winter and Ted Hesson

WASHINGTON, Dec 11 (Reuters) – A top FBI official called the anti-fascist movement antifa the biggest domestic terrorism threat to the U.S. during a congressional hearing on Thursday, ‍but struggled to answer detailed questions about the unstructured far-left campaign.

Michael Glasheen, operations director of the FBI’s National Security Branch, said antifa was the agency’s “primary concern” and “the most immediate violent threat that we’re facing.”

Glasheen did not answer a question from the top Democrat at the hearing, U.S. Representative Bennie Thompson, about the group’s ‌location. When asked about the number of members, Glasheen ‌said it was “very fluid” and that “investigations are active.”

“Sir, you wouldn’t come to this committee to say something th

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