NEW YORK — Life in lower Manhattan resembled any ordinary day on Wednesday as workers rushed to their jobs in the muggy heat, but time stood still at the World Trade Center site, where families wept for loved ones who perished in the terror attacks 12 years ago.
For the families, the memories of that day are still vivid, the pain still acute. Some who read the names of a beloved brother or a cherished daughter could hardly speak through their tears.
‘‘Has it really been 12 years? Or 12 days? Sometimes it feels the same,’’ said Michael Fox, speaking aloud to his brother, Jeffrey, who perished in the south tower. ‘‘Sometimes I reach for the phone so I can call you, and we can talk about our kids like we used to do every day.’’
On the memorial plaza overlooking two reflecting pools in the imprint of the twin towers, relatives recited the names of the nearly 3,000 people who died when hijacked jets crashed into the towers, the Pentagon, and in a field near Shanksville, Pa. They also recognized the victims of the 1993 World Trade Center bombing.
Bells tolled to mark the planes’ hitting the towers and the moments when the skyscrapers fell. ‘‘Tribute in Light’’ searchlights, turned on at sunset, illuminated the skies where the twin towers once stood.
In Washington, President Obama, Michelle Obama, Vice President Joe Biden, and Jill Biden walked out to the White House’s South Lawn for a moment of silence at 8:46 a.m., the time the first plane struck the north tower in New York. Another jetliner struck the Pentagon at 9:37 a.m.
‘‘Our hearts still ache for the futures snatched away, the lives that might have been,’’ Obama said.
A moment of silence was also held at the US Capitol.
In New York, loved ones milled around the memorial site, making rubbings of names, putting flowers by the names of victims, and weeping. Former governor George Pataki, Governor Chris Christie of New Jersey, and others attended. Mayor Michael Bloomberg watched the ceremony for his final time in office.
Carol Eckna recalled the contagious laugh of her son, Paul Robert Eckna, who was killed in the north tower.
‘‘Just yesterday, you were 28,’’ she said. ‘‘Today, you are 40. You are forever young. Dad and I are proud to be your parents.’’
The anniversary arrived amid changes at the Flight 93 National Memorial in Shanksville, where construction started Tuesday on a new visitor center. On Wednesday, the families of the passengers and crew aboard United Flight 93 recalled their loved ones as heroes for their actions. The plane was hijacked with the likely goal of crashing it into the White House or Capitol, but passengers tried to rush the hijackers in the cabin, and the plane crashed into the field. All aboard died.
‘‘In a period of 22 minutes, our loved ones made history,’’ said Gordon Felt, president of the Families of Flight 93, whose brother, Edward, died in the crash.
Outside Washington, hundreds of people gathered for a ceremony at an Arlington County plaza three miles from the Pentagon. First responders from the county were among the first on the scene that day.
Fire Chief James Schwartz said ceremonies like Wednesday’s — which featured an honor guard and a moment of silence— serve as a reminder of why first responders spend so much time preparing for disaster.
‘‘I’ve often said this has been the fastest 12 years of my life,’’ Schwartz said. ‘‘But if you are a surviving family member, I’d imagine this has been the longest 12 years of your life, because you’re waking up every day with a hole in your heart.’’
Bloomberg also spoke at a remembrance service for the 84 Port Authority employees killed on Sept. 11 at St. Peter’s Roman Catholic Church, in the shadow of where the World Trade Center once stood.
‘‘On that terrible day, we were united in prayer and compassion for all of you who lost loved ones,’’ the mayor said. ‘‘As we woke up this morning, our first thoughts were with you as well.’’