Homeland Security and the FBI issue a joint statement:
We have no information at this time indicating that this incident was either inspired, directed, or assisted by individuals associated with an identified designated foreign terrorist organization. However, the FBI investigation into his activities while overseas and the nature and extent of his affiliation with FTOs (foreign terrorist organizations) is ongoing. We have no information to date to suggest that these trips [over the past year to the Middle East] were associated with any nefarious or violent extremist activities
Authorities seek to determine if the shooter was inspired by ISIS or a similar organization or was a “lone wolf,” attack, where Abdulazeez acted on his own. U.S. Attorney Killian says that although the shootings are currently being investigated as “domestic terrorism”, they are not as of yet officially classified as an act of terrorism.