Several news sites and 9/11 conspiracy groups are reporting that 27 "new" photos of 9/11 were just released
However they are not new, they were released in 2011. The confusion seems to just be due to a reorganization of the FBI's web site.
The photos can be found on the following web page:
And archives date it back to 2011.
The collection of photos had previously been published on cryptome.org, and an Italian blog, but don't appear to be widely known. They were brought to people's attention when they were mistakenly included in the "Recently Added" page on fbi.gov:
That takes you to a page where the individual photos are listed with a 2017 date:
However if you click the link back up the hierarchy it takes you back to a page linking you to the 2011 page:
So it seems like a site reorganization simply created new dates for the images in their new setting. But the old 2011 pages are still accessible and archived, proving this is not a new release.