Inauguration Day security on high alert following pro-Trump riots

21,000 National Guardsmen and thousands of federal agents are part of the team keeping Washington, D.C. secure as the FBI continues to target nearly 300 suspects who stormed the Capitol.
2:49 | 01/19/21

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Transcript for Inauguration Day security on high alert following pro-Trump riots
Now to America on high alert one day before the inauguration. At least 21 states activating the National Guard. Our chief justice correspondent Pierre Thomas joins us now with new reports on how certain groups may plan to gain access to the inauguration. Reporter: Michael, good morning. With the inauguration a little more than 4 hours away, the final stage of the lockdown is now complete as we get chilling new details about yet more suspects involved in that terrible attack. All major bridges entering the nation's capital shut down this morning as of 6:00 A.M. Thousands of federal agents and police focusing on security with 21,500 National Guard now on duty. Now is not the time to come into our jurisdiction to create havoc. Reporter: Fencing with razor wire, restrictions on drones, helicopters patrolling the skies and police boats scouring the potomac river. The security measures coming as ABC news has obtained a new law enforcement bulletin raising the specter that right wing extremists like qanon and lone wolf attackers might try to pose as law enforcement and military to infiltrate security. All this as the FBI targets nearly 300 suspects who stormed the capitol combing through 200,000 videos and photographs, much of it tips from the public. The American people have demonstrated that they will not allow mob violence to go unanswered. Reporter: 100 arrested and counting. With disturbing new cases, more and more suspects in custody. On Monday Riley June Williams taken into custody in Pennsylvania. The FBI investigating whether she stole a laptop from speaker Nancy Pelosi's office with the intention of selling it to Russians. Also arrested an army reservist described by naval investigators in the criminal complaint as an avowed white supremacist and Nazi sympathizer. This man from Texas charged on Monday for his alleged role in the riot, prosecutors claiming in his charging document he threatened to shoot his children if they snitched on him. And the FBI is investigating whether this man tased D.C. Police officer Michael fanone who told ABC news a harrowing story about being beaten and hit with flags, fearing for his life. You know, while I was getting tased they were stripping my gear off of vest, they stripped my badge off, my radio. At one point people started chanting, kill him with his own gun. Reporter: Officials in state capitols across the country to remain vigilant. The city as you can see on high alert. Law enforcement confident in their planning but leery about the unknown, robin.

This transcript has been automatically generated and may not be 100% accurate.

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