The U.S. Secret Service on Wednesday paid tribute to those who died during the Sept. 11 attacks but accidentally included the 19 hijackers in a now-deleted social media post. 

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World Trade Center on fire on Sept. 11, 2001.

Smoke pours from the twin towers of the World Trade Center after they were hit by two hijacked airliners in a terrorist attack September 11, 2001 in New York City.  (Robert Giroux/Getty Images)

"The flag hanging in our headquarters is a solemn reminder of 9/11 and our mission’s purpose. A testament to freedom and sacrifice, it honors all 2,996 lives lost, including our own Master Special Officer Craig T. Miller & Special Agent in Charge Charles L. Friend," the organization wrote in a post on X.

The Sept. 11, 2001 terrorist attacks killed 2,977 people in the World Trade Center in New York City, the Pentagon, and in Shanksville, Pennsylvania, when the hijackers took over four commercial planes. 

The 19 hijackers appeared to be included in the figure first posted by the Secret Service. 

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9/11 museum in New York

American flags at the 9/11 memorial. The U.S. Secret Service accidentally honored the 19 hijackers in a now-deleted social media post.  (Rochlin/Getty Images)

The post was deleted and another with the correct number, 2,977, was posted online. 

"This is a correction of an earlier version of this post. In the original post, we erroneously included the total number of deceased from the Sept 11 attacks, which included the hijackers. Our intent was to only honor the victims of that tragic day and we deeply apologize for the error," the Secret Service posted.

In August, the Biden administration backtracked on a controversial plea deal for the terrorists behind the attack following public outrage. 

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Sept. 11 mastermind Khalid Sheikh Mohammad, as well as Walid Muhammad Salih Mubarak Bin 'Attash, and Mustafa Ahmed Adam al Hawsawi all await trial in Guantánamo Bay, Cuba.