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Photo: Tayfun Coskun/Anadolu Agency via Getty Images

The U.S. commemorated the 19th anniversary of the Sept. 11 terrorist attacks on Friday with ceremonies across the country, including at the World Trade Center Memorial Plaza, the Pentagon and the Flight 93 National Memorial near Shanksville, Pennsylvania.

Why it matters: Looming over the memorials is the coronavirus pandemic, which has forced a variety of communities to cancel or alter their 9/11 ceremonies, according to AP.

In photos:
A person running through goldenrod with an American flag at the Flight 93 National Memorial commemoration. Photo: Jeff Swensen/Getty Images
Joe Biden laying a wreath at the Shanksville Flight 93 Memorial. Photo by Jim Watson/AFP via Getty Images
President Trump and First Lady Melania Trump laying a wreath during a ceremony commemorating the 19th anniversary of the 9/11 attacks, in Shanksville, Pennsylvania. Photo: Brendan Smialowski/AFP via Getty Images
Around 3,000 flags at a 9/11 memorial at Pepperdine University in Malibu, California. Photo: Valerie Macon/AFP via Getty Images
People place American flags to represent the lives lost during the 9/11 attacks, outside of the Capitol. Photo: Caroline Brehman/CQ-Roll Call, Inc via Getty Images
Democratic House leadership arrives for a moment of silence on the House steps of the Capitol to honor 9/11 victims. Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images
Vice presidents Mike Pence and Joe Biden bump elbows at a ceremony at the 9/11 Memorial in New York City. Photo: Amr Alfiky/POOL/AFP via Getty Images

Go deeper

In photos: First coronavirus vaccines administered in the U.S.

The first doses of Pfizer's long-awaited coronavirus vaccine were distributed in the U.S. on Monday.

The state of play: Vaccines will first go to frontline health care workers followed by older and vulnerable populations. The distribution of Pfizer vaccine marks the beginning of a possible end of the coronavirus pandemic, and may soon be followed by a rollout of vaccines from Moderna and AstraZeneca.

What's ahead for the newest female CEOs

Jane Fraser (L) and Rosalind Brewer. Photos: Jason Redmond/AFP via Getty Images; Rodrigo Capote/Bloomberg via Getty Images.

The number of women at the helm of America’s biggest companies pales in comparison to men, but is newly growing — and their tasks are huge.

What's going on: Jane Fraser took over at Citigroup this week, the first woman to ever lead a major U.S. bank. Rosalind Brewer will take the reins at Walgreens in the coming weeks (March 15) — a company that's been run by white men for more than a century.

2 hours ago - Health

Biden says U.S. will have enough vaccines for 300 million adults by end of May

President Biden. Photo: Anna Moneymaker-Pool/Getty Images

President Biden on Tuesday said that ramped-up coronavirus vaccine production will provide enough doses for 300 million Americans by the end May.

Why it matters: That's two months sooner than Biden's previous promise of enough vaccines for all American adults by the end of July.