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VIRGINIA BEACH - FBI officials say there are more homegrown violent extremists out there and law enforcement officials need help from private citizens in finding them before the next domestic attack.

That word came from agents attending the Fourth Annual Law Enforcement Seminar Luncheon in Norfolk, eight days after the Boston Marathon bombings killed three people and wounded at least 176 others.

'These threats are real, they exist today, they exist right here in our communities all across the country, and we have to remain vigilant,' said Royce Curtin, Special Agent in Charge, Federal Bureau of Investigation, Norfolk Field Office.

Curtin said events in Boston last week demonstrate how citizens can act as the eyes and ears for police. 'Not only can it happen, it did happen, and it's a reminder we all have to continue to be hyper-vigilant and report any suspicious activity to law enforcement,' said Curtin.

New details are emerging about the dramatic capture following the 20-hour manhunt for Dzhokhar Tsarnaev. Police and federal agents closed in on Tsarnaev after a Watertown resident reported a bloodied person hiding in his boat. A helicopter beamed back thermal images of the outline of Tsarnaev's body.

Tsarnaev has been charged with one count of using a weapon of mass destruction resulting in death and one count of malicious destruction of property.

The Justice Department released a statement indicating the charges could carry the death penalty or life in prison.

Following today's seminar, Hampton police captain Orrin Gallop said the Watertown resident's involvement shows how important civilians can be. 'It's really the people that are our eyes and ears because we can't be everywhere, so we really depend upon citizens to let us know,' Gallop said.

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