UPDATED 1/6, 11:26 p.m.: The death toll from Wednesday's attack on the U.S. Capitol is now at 4, according to D.C. Police Chief Robert Contee, the Associated Press reports.

Three of the people died of "medical emergencies."

UPDATED 1/6, 9:18 p.m.: The woman who was fatally shot has been identified as Ashli Babbit.

UPDATED 1/6, 5:54 p.m.: The woman who was shot inside the Capitol building has reportedly died.

NBC Washington reporter Rick Yarborough shared the news via Twitter on Wednesday, citing law enforcement sources.

Dustin Sternbeck, a spokesperson with the Metropolitan Police Department confirmed to CNN that the unidentified woman has been pronounced dead at a hospital.

"Additional details will be forthcoming as this remains an active MPD investigation," Sternbeck said. 

See the original story below.

At least one person was shot inside the U.S. Capitol on Wednesday shortly after pro-Trump demonstrators stormed and breached the building. MSNBC aired a graphic video of the apparent victim being carried out of the Capitol on a stretcher.

According to CNN, the victim is a woman who sustained a gunshot wound to the chest. Sources tell the network the woman is currently receiving medical care, but remains in critical condition.

The identity of the victim and the circumstances surrounding the reported shooting are still unknown. Outlets report the shooting occurred around 3 p.m. local time.

Trump supporters began conducting rallies in Washington, D.C., this week as Congress prepared to certify Joe Biden's Electoral College victory. The protests are part of the right-wing "Stop the Steal" campaign, which aims to overturn the 2020 presidential election results in Trump's favor. The lame-duck president has repeatedly said he was cheated out of a second consecutive term, but has not provided any solid evidence to support this claim.

Video showed the Trump supporters outside the Capitol building breaking its doors and windows before successfully breaching the building. Congress members were inside at the time, and the vote to certify Biden was halted. House and Senate members were reportedly evacuated and authorities placed the building on lockdown. 

"Due to an external security threat located on the West Front of the U.S. Capitol Building, no entry or exit is permitted at this time," law enforcement said in a statement to NPR. "You may move throughout the building(s) but stay away from exterior windows and doors. If you are outside, seek cover."