FBI found Alshamrani had 'significant ties to al Qaeda' -Barr

"The phones contained information, previously unknown to us, that definitively establishes Alshamrani's significant ties to al Qaeda in the Arabian Peninsula," Barr said.

The shooter, Second Lieutenant Mohammed Saeed Alshamrani, 21, was killed by law enforcement during the Dec. 6, 2019 attack.

He was on the base as part of a U.S. Navy training program designed to foster links with foreign allies.

The Justice Department succeeded in unlocking the encryption on the shooter's iPhone after Apple Inc declined to do so, Barr told reporters on a conference call.