FILE - In this Dec. 16, 2019 file photo, Fran Bitter, a volunteer with the Patriot Guard Riders of Georgia, salutes a group of sailors as they enter a funeral service for U.S. Navy Airmen Apprentice Cameron Walters at the Compassion Christian Church in Savannah, Ga. Walters was one of three Navy sailors killed in a Saudi gunman's attack at Naval Air Station Pensacola in Florida on Dec. 6. The FBI has found a link between the gunman in a deadly attack at a military base last December and an al-Qaida operative. That's according to a U.S. official who spoke to The Associated Press on Monday. (Stephen B. Morton/Atlanta Journal-Constitution via AP)

WASHINGTON - The gunman who killed three U.S. sailors at a military base in Florida last year communicated with al-Qaida operatives about planning and tactics in the months leading up to the attack, U.S. officials said Monday, as they lashed out at Apple for failing to help them open the shooter's phones so they could access key evidence.

Law enforcement officials discovered contacts between Mohammed Saeed Alshamrani and operatives of al-Qaida after FBI technicians succeeded in breaking into two cellphones that had previously been locked and that the shooter, a Saudi Air Force officer, had tried to destroy before he was killed by a sheriff's deputy.

“We now have a clearer understanding of Alshamrani's associations and activities in the years, months and days leading up to his attack,” Attorney General William Barr said at a news conference in which he chastised Apple for not helping open the phones.

The new details, including that Alshamrani had been radicalized abroad before he arrived in the U.S., raise fresh questions about the vetting of foreign military members and trainees who spend time at American bases. The announcement also comes amid tension with the U.S. over instability in the oil market during the coronavirus pandemic and as the Trump administration faces criticism that it has not done enough to hold the kingdom, which has been trying to improve its international image, accountable for human rights violations.

The criticism directed at Apple could also escalate divisions between the U.S. government and the technology company, which rejected the characterization that it has been unhelpful. The company said Monday that it does not store customers' passcodes, does not have the capacity to unlock passcode-protected devices and that weakening encryption could create vulnerabilities that undermine national secuity and data privacy.

Alshamrani was killed by a sheriff’s deputy during the Dec. 6 rampage at a classroom building at Naval Air Station Pensacola. He had been undergoing flight training at Pensacola as part of instruction offered at American military bases to foreign nationals. Besides the three sailors who died, eight other people were injured.

Once unlocked, U.S. officials said, the phones revealed contact between Alshamrani and “dangerous" operatives from al-Qaida in the Arabian Pensinsula, or AQAP, that continued until shortly before the shooting. They also revealed that he had been radicalized since at least 2015, before he arrived in the U.S., and had meticulously planned the attack.

Alshamrani created minicam videos as he cased a military school building and saved a will on his phone that purported to explain himself — the same document AQAP released after the shooting when it claimed responsibility for it, said FBI Director Chris Wray, who called the attack “the brutal culmination of years of planning and preparation.”

“He wasn’t just co-ordinating with them about planning and tactics," Wray said. “He was helping the organization make the most it could out of his murders.”

Asked whether al-Qaida had directed or inspired the attacks, Wray said it was “certainly more than just inspired."

The phones have already yielded valuable intelligence, officials said, citing a recent counterterrorism operation in Yemen that targeted an AQAP associate Alshamrani had been in touch with.

The Justice Department had asked Apple to help extract data from two iPhones that belonged to the gunman, including one that authorities say Alshamrani damaged with a bullet after being confronted by law enforcement.

But Wray said Apple provided “effectively no help,” delaying by months the FBI's ability to access the devices and hampering the investigation since agents did not have a full picture of what to look for or ask about. He did not say what method was used to open the phones, but said it was a targeted fix and not a broad solution to the problem.

Barr used Monday’s news conference to forcefully call on Apple to do more to co-operate with law enforcement.

“In cases like this, where the user is a terrorist, or in other cases, where the user is a violent criminal, a human trafficker, a child predator, Apple’s decision has dangerous consequences for public safety and the national security and is, in my judgment, unacceptable,” Barr said.

In a statement Monday, Apple said it had provided the FBI with “every piece of information available to us, including iCloud backups, account information and transactional data for multiple accounts." It rejected the idea of making its products more accessible for law enforcement’s benefit.

“It is because we take our responsibility to national security so seriously that we do not believe in the creation of a backdoor — one which will make every device vulnerable to bad actors who threaten our national security and the data security of our customers," the statement said. "There is no such thing as a backdoor just for the good guys, and the American people do not have to choose between weakening encryption and effective investigations.

Law enforcement officials had previously left no doubt that Alshamrani was motivated by jihadist ideology, saying he visited a New York City memorial to the attacks of Sept. 11, 2001, over the Thanksgiving holiday weekend and posted anti-American and anti-Israeli messages on social media just hours before the shooting.

Separately, AQAP, al-Qaida’s branch in Yemen, released a video claiming the attack. AQAP has long been considered the global network’s most dangerous branch.

In January, U.S. officials announced that they were sending home 21 Saudi military students after an investigation revealed that they had had jihadist or anti-American sentiments on social media pages or had “contact with child pornography.”

Operational training for Saudi students at multiple U.S bases was suspended soon after the shooting, but the Pentagon has since given the Navy and other military services conditional approval to resume the instruction.

Barr said Monday that the Saudis have been co-operative and have worked with the U.S. to buttress vetting.

In a statement, the Saudi Embassy in the U.S. lauded the developments in the investigation of the shooting and reiterated the Saudi government's support of relations with the U.S. and joint efforts against extremism.

“We will never let the terrorists win, or allow their acts of hatred to divide us,” the embassy said. "The U.S.-Saudi partnership is one of the primary pillars of the global effort to dismantle and defeat terrorist networks such as AQAP. And our two countries will maintain our unbreakable commitment to combat the forces of evil, wherever they exist.”

News from © The Associated Press, 2020