The 21-year-old member of the Royal Saudi Air Force opened fire at the base in early December, killing three USA sailors and wounding eight others.
Barr also said investigators found that 21 other Saudi nationals who were in the country for military training, were in possession of "derogatory material". "During the course of the investigation, we learned that the shooter posted a message on social media on September 11th of previous year that said, 'the countdown has begun'".
They said the 21-year-old shooter acted alone when he killed three American service members and injured eight others on December 6. The FBI has been trying to determine who Alshamrani had been speaking to prior to last month's attack.
After a gunman killed 14 people in a terrorist attack in San Bernardino, Calif., in 2015, Apple defied a court order to help the Federal Bureau of Investigation unlock the shooter's phone.
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"This situation perfectly illustrates why it is critical that the public be able to get access to digital evidence", Barr said during a press conference Monday, noting that the company has not provided "substantive assistance".
"This was an act of terrorism", Barr said. Apple has already provided law enforcement officials with information from Alshamrani's iCloud account, but the two iPhones are passcode protected (one is also damaged from gunfire) and Apple has in he past taken a strong position against providing access to locked iPhones.
Apple Inc and the USA government are once again at odds over access to iPhones involved in a terrorist attack, putting the world's largest technology company under renewed pressure to weaken privacy features that have become a key selling point.
Trump in his tweet said, "We are helping Apple all of the time on TRADE and so many other issues, and yet they refuse to unlock phones used by killers, drug dealers and other violent criminal elements". "Within hours of the FBI's first request on December 6, we produced a wide variety of information associated with the investigation".
At the time, Apple pushed back by noting that the company is unable to access newer model iPhones given that the encryption keys used to protect them are stored on the devices themselves.