luggage also contained papers that revealed the identity of all 19 hijackers, along with a copy of Atta's last will and testament. The passport of hijacker Abdulaziz Alomari was also found in Mohamed Atta's left-behind luggage. Various items of evidence were found in vehicles left behind at the airports, in luggage that did not make it onto the flights, and at the crash scenes. A rental car belonging to the hijackers was found at Boston's Logan International Airport, which contained an Arabic language flight manual and documents from Huffman Aviation in Florida. There, investigators were able to find Mohamed Atta and Marwan al-Shehhi's previous address in Hamburg, Germany. Nawaf al-Hazmi's 1988 blue Toyota Corolla was found on September 12 in Dulles International Airport's hourly parking lot. Inside the vehicle, authorities found a letter written by Mohamed Atta, maps of Washington, D.C., and New York City, a cashier's check made out to a Phoenix flight school, four drawings of a Boeing 757 cockpit, a box cutter-type knife, and a page with notes and phone numbers. In New York City, a passport belonging to Satam al-Suqami was found by a passerby before the towers collapsed, and given to a NYPD detective. The passports of two of the hijackers of Flight 93 were also found intact at the crash site. On September 27, 2001, the FBI released photos of the 19 hijackers, along with information about the possible nationalities and aliases of many. Assigning responsibility For several months following the September 11 attacks, no one, nor any group, claimed responsibility for the attacks, so the primary responsibility fell solely upon the hijackers, all of whom were killed and all of whom left no message or any claim of responsibility, explaining why they had carried out the attacks. As the media covered the 9/11 attacks unfolding, many quickly speculated that bin Laden was behind the attacks. On the day of the attacks, the National Security Agency intercepted communications that pointed to bin Laden, as did German intelligence agencies. This helped rule out other immediate suspects, such as Croatian nationalists, who had planted a bomb in Grand Central Terminal on September 10, 1976. Authorities in the United States and Britain also obtained electronic intercepts, including telephone conversations and electronic bank transfers, which indicate that Mohammed Atef, a bin Laden deputy, was a key figure in the planning of the 9/11 attacks. Intercepts were also obtained