After 9/11, the FBI warned the public about a number of potential terrorists they believed were being groomed for an encore attack. The feds described them as “the next Mohamed Atta” and put them on their Most Wanted Terrorists list. Today, these dangerous suspects remain on that same list and are still at large. Yet oddly, the FBI no longer talks about them.

The only thing that’s changed, besides the descriptions of their appearances, is that the FBI is now offering bigger rewards for them, along with several key al Qaeda leaders also still on the loose.

Families of 9/11 victims want to know why, after two wars costing trillions of dollars, do we appear no closer to capturing these top terrorists? Did the FBI stop hunting for them? Has it given up hope of finding them?

Terrorism experts are equally troubled by the delay in bringing them to justice.

“I’m concerned about these individuals still being at large,” said Philip Haney, former Department of Homeland Security counterterrorism analyst. “It should be the government’s top priority to locate and apprehend them.”

One would-be terrorist who was said to be planning to lead another attack on the US, following in the footsteps of 9/11 ringleader Atta, is the English-speaking Adnan G. El Shukrijumah, who spent time in Florida before fleeing the country in the wake of the attacks.

The Saudi-born suspect, also known as “Jaffar the Pilot,” is still featured prominently on the FBI’s website as a Most Wanted Terrorist. (The bureau has added a “digitally enhanced” photograph of Shukrijumah sporting a full Islamic beard.) In 2010, the feds indicted the 43-year-old for his alleged role in a 2009 plot to attack New York’s subway system.

The FBI believes Shukrijumah is helping run al Qaeda’s operations from Pakistan, while Islamabad claims its military killed him years ago. Considering that Pakistan has lied before about killing al Qaeda members — and about harboring Osama bin Laden — US officials are dubious of its claim.

FBI headquarters confirmed the Shukrijumah case remains open and that counterterrorism agents are still hunting for the indicted fugitive.

“The cases you mention remain open, active FBI investigations with large rewards continuing to be available to those who provide information about the cases mentioned,” said Michelle Goldschen of the FBI’s Office of Public Affairs in Washington.

Shukrijumah also has New York connections. His late father served as a translator for the “Blind Sheik,” Omar Abdel Rahman, at his mosque in Brooklyn before he was imprisoned for his role in the 1993 World Trade Center bombing and other terrorist plots.

After 9/11, the US government fingered the street-smart Shukrijumah as the ultimate al Qaeda “sleeper agent,” and potentially more dangerous than even Atta. In fact, he was said to have been handpicked by 9/11 mastermind Khalid Sheikh Mohammed, aka KSM, to carry out an encore plot to detonate nuclear devices in several US cities simultaneously.

Today, his mentor KSM is locked up at Gitmo, where he awaits punishment for his crimes — which frustrates 9/11 survivors to no end.

‘You have to wonder whether, perhaps, the US government has just done a cost-benefit analysis and determined that it’s not quite worth their time…’

“When you consider the US government’s absolute ineptitude and abject failure to prosecute those they currently already have in custody in Gitmo — where they’re still in the pretrial phase 17 years after the attacks — you have to wonder whether, perhaps, the US government has just done a cost-benefit analysis and determined that it’s not quite worth their time to bring any al Qaeda terrorists to justice or provide a modicum of accountability and closure to the innocent victims of terrorism,” said Kristen Breitweiser, who lost her husband, Ronald, in the World Trade Center’s south tower.

Another potentially dangerous suspect still eluding authorities is Abderraouf Jdey. Also known as Faruq al-Tunisi, he is a trained pilot who has a Canadian passport and was said to be slated for a “second wave” of suicide attacks after 9/11. He was identified in martyrdom videos recovered in Afghanistan.

An FBI poster places a $5 million bounty on Jdey’s head and includes a photo “retouched” to show how the 53-year-old might look today. The New York field office is handling tips on Jdey, along with Shukrijumah. (Unlike Shukrijumah, Jdey has not been indicted in absentia.)

Then there are the still-at-large al Qaeda leaders Saif al-Adel, Abdullah Ahmed Abdullah and Ayman al-Zawahiri.

The trio was listed among the FBI’s Most Wanted Terrorists after 9/11 and the three remain there today — in spite of $10 million rewards for information leading to the capture of both al-Adel and Abdullah and an additional $25 million bounty for Zawahiri. Just last month, the US doubled the reward offers for al-Adel and Abdullah.

Zawahiri took command of al Qaeda in 2011 after US forces killed kingpin Osama bin Laden, who for years was sheltered in Pakistan. While we don’t hear much about al Qaeda anymore, it’s alive and well. In fact, terrorism experts warn it’s been growing in strength, not waning, since bin Laden’s death.

Zawahiri has declared plans to replace ISIS at the forefront of global jihad. He’s also given a central role in the organization to bin Laden’s son, Hamza. And he recently called on Muslims during a 17-minute videotaped address to attack American interests “everywhere” — echoing a fatwa issued by bin Laden before the 9/11 attacks.

DHS’s Haney said that Zawahiri is “consolidating power” under a new terror umbrella — AQIS, or al Qaeda in the Indian Subcontinent — adding that the center of gravity of the global jihadist movement is shifting to that region.

“An argument could be made that Zawahari is not only the world’s most experienced jihadist now, but also the most dangerous one,” Haney warned.

And yet the FBI still cannot seem to get much traction hunting down him or other 9/11-era terrorists.

The FBI declined to comment on why it’s taken so long to capture these bad guys.

“We would decline any further comment due to the ongoing nature of the current investigations,” Goldschen said.

Paul Sperry is a bestselling author and former Hoover Institution media fellow.