Four people are dead, 52 were arrested and 14 police officers are injured after a melee in the nation's capital Wednesday afternoon. The FBI is opening up an investigation into the havoc brought about by pro-Trump rioters who breached the U.S. Capitol building just as Electoral College voter certification was getting under way.

In an unprecedented day in U.S. history, thousands of protesters swarmed the U.S. Capitol grounds and hundreds breached the building itself in hopes off thwarting President-elect Joe Biden's victory. The process is a largely ceremonial one and is spelled out in the Constitution. 

Windows were smashed, lawmaker's offices were vandalized and the Senate and House were defiled as protesters ran amok.

D.C. Police Chief Robert Contee said there were four fatalities: a woman who was shot by the U.S. Capitol Police, as well as three others. These included   two men and one woman who died in what were listed as:  “separate medical emergencies.” Police had made "in excess of 52 arrests," including 26 on U.S. Capitol grounds itself, there police chief said.

The FBI is seeking the public's help in identifying members of the unlawful mob.

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