What religious extremists? For the love of god, Israel was behind the attack. You want the names of the IDF / Mossad demolition experts who rigged the towers? Look up the 600 page DEA report on the Israeli Art Students. The same people who were allowed to live on the 91st floor for a year with 24 hr access to both buildings. They took pictures of themselves rigging the buildings.
The 5 dancing Israeli's who were arrested celebrating their handi work went back to Israel and admitted their involvement Every bit of real evidence lead back to them. Including the Mossad moving company front that had moving trucks with murals of planes flying into the towers driving around that day. You can listen to the 911 dispatch tapes reporting one on the George Washington bridge.