WILMINGTON, Del. - President-elect Joe Biden expressed his "deep sympathy" to the family of the U.S. Capitol Police officer who died in the violent siege of the building by supporters of President Donald Trump and vowed those responsible will be held accountable."Our sympathies and our concerns go out to his family, and the people responsible should be held accountable — and they will be," Biden said during an event Friday in Wilmington, Delaware, to introduce additional key nominees of his economic and jobs team.U.S.
Capitol Police said Officer Brian Sicknick, 42, was responding to the mob who swarmed the Capitol and violently clashed with police.