WASHINGTON (AP) — The FBI says it won’t publicly disclose the method that allowed it to access a locked iPhone used by one of the San Bernardino attackers.

In a statement Wednesday, FBI official Amy Hess said the FBI does not “have enough technical information” about the software vulnerability that was exploited to make it public.

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An unidentified third party approached the federal government last month with a method that it said could get into the phone used by Syed Farook, who along with his wife killed 14 people in the December attacks.

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The method proved successful.

But the FBI said Wednesday that although it paid for the method, it did not “purchase the rights to technical details about how the method functions.”

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