The milestone anniversary brought memorial rituals — wreath-laying, flag-flying, moments of silence, vigils and readings of victims’ names — and volunteer projects in tribute to a day that about half of U.S. adults remember as the most historic event of their lifetime.

Friday will mark 25 years since the World Trade Center attacks on Sept. 11, 2001. Between the attacks themselves, the lasting health impacts on survivors and ensuing wars, the death toll for Americans is in the tens of thousands.

New York City has released more than 170,000 pages of previously undisclosed records about air quality following the Sept. 11, 2001, attacks, showing city officials at the time knew conditions around Ground Zero were unsafe to breathe despite repeated assurances to the public.

On Thursday, America marked the 24th anniversary of the deadly attacks with solemn ceremonies in New York, at the Pentagon and in Shanksville, Pennsylvania. The commemorations were punctuated by moments of silence, the tolling of bells and the reading of the names of the nearly 3,000 killed.

Some are the children of victims whose partners were pregnant. More of the young readers are victims’ nieces, nephews or grandchildren. They have inherited stories, photos, and a sense of solemn responsibility.

From ground zero to small towns, Americans looked back Monday on 9/11 with moments of silence, tearful words and appeals to teach younger generations about the terror attacks 22 years before.

The Taliban raised their flag over the Afghan presidential palace Saturday, a spokesman said, as the U.S. and the world marked the 20th anniversary of the Sept. 11 attacks.

The document released Saturday, on the 20th anniversary of the attacks, is the first investigative record to be disclosed since President Joe Biden ordered a declassification review of materials that for years have remained out of public view. 

Presidents Joe Biden, Barack Obama and Bill Clinton all gathered at the site where the World Trade Center towers fell two decades ago. 

The ceremony at ground zero in New York began exactly two decades after the deadliest act of terrorism on U.S. soil started with the first of four hijacked planes crashing into one of the World Trade Center’s twin towers.

This 9/11 comes little more than two weeks after a suicide bomber in Kabul killed 13 U.S. service members as the military concluded its withdrawal from Afghanistan. 

Two decades after the twin towers’ collapse, people are still coming forward to report illnesses that might be related to the attacks. 

Ten years after the 9/11 attacks, Americans were reasonably positive about the state of their rights and liberties. Today, after 20 years, not as much.

Oak Lawn is a southwest suburb bordering parts of Chicago. Along with surrounding suburbs, it has a strong Muslim community. And its fire and police departments sent members to support New York firefighters after the 9/11 attack. 

Saturday marks the 20th anniversary of the deadliest terrorist attack on U.S. soil. Local experts join us to discuss what we’ve learned about terrorist threats since then — and how safe we are today.

Two planned skyscrapers, a performing arts center and a church are still unfinished at the World Trade Center complex, which plays host Saturday to the annual ceremony honoring nearly 3,000 people killed in the attacks.