Disturbing video shows the moment DC Metropolitan Police officer Mike Fanone screamed out as he was tasered in the head by a mob during the Capitol Riots in January.
In this interview, he tells the BBC he feared for his life as he was seized by protesters outside the Capitol.
Supporters of then-President Donald Trump stormed the building following his election defeat.
Viewers in the UK can watch Four Hours at the Capitol on BBC Two at 9pm on 20 October, and on BBC iPlayer.
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