Disturbing video exhibits the second DC Metropolitan Police officer Mike Fanone screamed out as he was tasered within the head by a mob in the course of the Capitol Riots in January.
On this interview, he tells the BBC he feared for his life as he was seized by protesters exterior the Capitol.
Supporters of then-President Donald Trump stormed the constructing following his election defeat.
Viewers within the UK can watch 4 Hours on the Capitol on BBC Two at 9pm on 20 October, and on BBC iPlayer.
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