President Donald J. Trump and First Lady Melania Trump Wednesday observed a moment of silence to commemorate the 18th anniversary of the September 11 attacks on the White House lawn.

The U.S. president tweeted, “We will never forget 9.11.01.”

The U.S. president tweeted, “We will never forget 9.11.01, Sept. 11, 2019. (Screenshot/Donald J. Trump)

Eighteen years later, Americans still remembers the day when terror struck on American soil, taking away the lives of nearly 3,000 innocent people.

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President Trump and First Lady Melania Trump walked out of the White House past the Color Guard onto the South Lawn. Together they stood for a moment of silence as the bell tolled.

Families of victims join the first couple for the solemn ceremony.

The White House flag flew at half-staff. As the bugle played “Taps,” the first couple placed their hand over their heart.

After the ceremony, President Trump traveled to the Pentagon to give a speech in honor of the nearly 3,000 people who died in the deadliest attack on American soil.

At the Pentagon, President Trump sent a twitter message to the American people: “The First Lady and I are united with you in grief…”

As part of the honoring ceremony, earlier on Wednesday morning, in Arlington, Virginia, the Pentagon marked Sept. 11 with the unfurling of the American flag from the roof of its building.

New York City remembered 9/11 with a solemn procession of the American flag, the singing of the national anthem, followed by a moment of silence when the bell struck at 8:46 a.m.—the time when the first plane slammed into the World Trade Center’s north tower.

Hundreds, including the relatives of victims, gathered at ground zero for the 18th anniversary observance. All victims’ names were read aloud during the ceremony.

The New York Stock Exchange, in collaboration with the New York Fire Department (FDNY) and New York Police Department (NYPD), held a moment of silence to remember the September 11 attacks. Traders on the floor paused to honor victims with a moment of silence.

“We lost 23 brothers & sisters on September 11, 2001, and continue to lose more from 9/11-related illnesses,” NYPD tweeted, and inviting people to, “Join us as we pay tribute to each of the fallen we have lost since that day 18 years ago.”

On Wednesday night, New York City will display the “Tribute in Light.” The two light beams, symbolizing the fallen twin towers, will shine as a tribute to all those who died in the 9/11 attacks.

It has been 18 years since the attacks that stunned Americans and the rest of the world, when four hijacked commercial planes crashed into the World Trade Center, the Pentagon, and a field near Shanksville, Pennsylvania, on Sept. 11, 2001.