January 6 hearing opens as police detail violence and injuries

US Capitol Police Sgt Harry Dunn wipes his eyes during the House select committee hearing (Andrew Harnik/AP)

Four officers who defended the US Capitol during the January 6 insurrection have given emotional and angry accounts of the attack.

Capitol Police Officer Aquilino Gonell told House investigators he could feel himself losing oxygen as he was crushed by rioters – supporters of former President Donald Trump – as he was defending the Capitol in Washington DC during the January 6 insurrection.