(CNN) -- One woman was fatally shot by police and three people died of apparent medical emergencies Wednesday when a mob of President Trump's supporters stormed the US Capitol.

What we know about the 4 deaths in the pro-Trump mob that stormed the Capitol

Protesters supporting President Donald Trump break into the Capitol on January 6, 2021 in Washington, DC, while Congress held a joint session to ratify President-elect Joe Biden's 306-232 Electoral College win over Trump. Win McNamee/Getty Images

The four people died during a stunning attack at the heart of American democracy as members of the mob vandalized the building and assaulted police officers.

[READ: Trump supporters storm US Capitol, lawmakers evacuated]

At least 14 DC Metropolitan Police officers were injured, including one who was hospitalized after suffering serious injuries when he was pulled into a crowd and assaulted, Police Chief Robert Contee said. One officer had significant facial injuries from being struck by a projectile, and another officer was hospitalized after being pepper-sprayed.

Metro Police made 80 arrests related to unrest this week in downtown DC, including 68 arrests Wednesday night, according to a mayor's spokeswoman. Most were for violations of the mayor's 6 p.m. curfew.

Here's what we know about the people who died:

Woman shot by police

An adult woman identified as Ashli Babbitt was fatally shot by a US Capitol Police employee as the mob tried to force their way toward the House Chamber where members of Congress were sheltering, US Capitol Police said in a statement.

Babbitt was given medical assistance immediately and taken to a local hospital, where she was pronounced dead, police said.

The employee has been placed on administrative leave and their police powers have been suspended pending a joint Metro Police and USCP investigation, USCP said.

[Read: Congresswoman Cori Bush calls for expulsion of members who 'incited domestic terror attack']

"This is a tragic incident, and I send my condolences to the victim's family and friends," Metro Police Chief Contee said.

Two people who saw the shooting, left-wing activist John Sullivan and documentary filmmaker Jade Sacker, provided CNN with video of the incident and described the moments beforehand.

Sullivan said rioters were using flag poles and other items to smash glass windows inside the Capitol. The woman then tried to make her way through the window when several people with guns came out through the doorways.

"The second that she climbed through the window she got shot right in the neck area, fell backwards," Sullivan said in an interview that broadcast on CNN's "Anderson Cooper 360."

"I just remember the sense of shock and sorrow that somebody just died and did not need to die."

The woman was trying to enter an area that did not yet appear to have been breached by rioters, Sullivan said.

"It was an area that was completely blocked off," he said. "They had chairs up against the doorway, tables, so people couldn't get in."

Three others dead

Chief Contee also said three people died from "medical emergencies" during the riot.

"One adult female and two adult males appear to have suffered from separate medical emergencies, which resulted in their deaths," he said. "Any loss of life in the District is tragic and our thoughts are with anyone impacted by their loss."

Earlier Wednesday, DC Fire and Emergency Medical Services transported people to area hospitals with injuries ranging from cardiac arrest to multiple fractures after falling from scaffolding on the West front of the Capitol building.

However, city officials did not say whether any of these people are the ones who died.

CNN's Adrienne Winston, Kara Scannell, Alex Marquardt and Aileen Graef contributed to this report.

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