Naif Abdulaziz M. Alfallaj, a Saudi citizen, came to the United States in 2011 on a nonimmigrant visa, as his wife had a student visa. In October 2016, Alfallaj enrolled in a private flight school in Oklahoma. As part of the enrollment process, Alfallaj submitted copies of his passport and visa as well as his fingerprints to the Transportation Security Administration. In November 2017, the FBI performed a fingerprint analysis of documents that the U.S. military obtained from an Al Qaeda safe house in Afghanistan in December 2001. Alfallaj's fingerprints matched 15 latent fingerprints on those documents. He had allegedly filled out a "Mujahedeen Data Form" when he attended an Al Qaeda training camp in Afghanistan in 2000. The FBI found Alfallaj's fingerprints on three of the form's five pages, and the information on the form, such as Alfallaj's place of birth and his father's mobile phone number, matched information Alfallaj and Alfallaj's father had given U.S. authorities on visa applications.