It was the latest move in a public and symbolic showdown between the US government and technology companies, both of which are keen to set a precedent over how far US investigators can dictate tech firms handling of their customers' data.
Apple Chief Executive Tim Cook also sent a letter to employees Monday morning, making clear the company's hardline stance addresses broader issues, not just the phone in question.
"This case is about much more than a single phone or a single investigation," Cook said in the email to employees, seen by Reuters. "At stake is the data security of hundreds of millions of law-abiding people, and setting a dangerous precedent that threatens everyone's civil liberties."
The US Federal Bureau of Investigation is seeking the company's help to access Syed Rizwan Farook's phone by disabling some of its passcode protections, which the government said are "non-encryption barriers."
The latest volley from Apple followed a highly unusual call with reporters held by senior Apple executives on Friday to respond to the US Department of Justice's motion asking Apple to comply with a judge's order to unlock Farook's county-owned work phone.
But prosecutors acknowledged that their order, also issued Friday, was "not legally necessary" since Apple had not yet responded to the initial court order issued last week. The motion instead targeted Cook's open letter to customers last week and criticiSed the company's stance as a "brand marketing strategy."
The Justice Department's manoeuvres over the past week,which included going public with a kind of case that typicallywould be sealed and soliciting victims to file their own legal briefs, have prompted some Apple supporters to suggest the case is a public relations stunt while noting that Farook's workphone likely contains little data of value to investigators.
Farook and his wife, Tashfeen Malik, destroyed their personal phones before carrying out the December 2 shooting rampage in San Bernardino, California, which killed 14 and wounded 22. Authorities believe the couple was inspired by the Islamic State. The phone at issue is an iPhone 5c issued to Farook by San Bernardino County in his role as a health inspector.
Privacy advocates and technologists have accused prosecutors of choreographing the case to achieve a broader goal of gaining support for legislation or a legal precedent that would force companies to crack their encryption for investigators.
- Reuters