Acting Pentagon chief: No indication of insider threat before inauguration

FILE PHOTO: Members of the U.S. National Guard arrive, as the U.S. Capitol goes into lockdown during the dress rehearsal ahead of U.S. President-elect Joe Biden's inauguration in Washington, U.S., January 18, 2021. Rod Lamkey/Pool via REUTERS

WASHINGTON (Reuters) - The acting Pentagon chief said on Monday the FBI is assisting the U.S. military in vetting more than 25,000 National Guard troops being deployed to assist in protecting the U.S. Capitol around President-elect Joe Biden's inauguration for potential security concerns.

After the Jan. 6 Capitol assault by supporters of President Donald Trump that resulted in five deaths and sent lawmakers into hiding, the U.S. government has imposed unprecedented security surrounding the Capitol, including non-scalable fences rimmed with razor wire and a large security zone that the public is barred from.