The agents, Christopher Lorek, 41, and Stephen Shaw, 40, were part of the Critical Incident Response Group based at Quantico, The Washington Post reported.
A source told WAVY-TV, Portsmouth, the accident may have involved a helicopter. An FBI spokeswoman in Norfolk said gunfire was not involved.
FBI Director Robert Mueller released a statement saying the agents accepted "the highest risk each and every day," calling them "two brave and courageous men."
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