FBI managed to hack iPhone without Apple’s help

Source: http://www.usatoday.com/story/news/nation/2016/03/28/apple-justice-department-farook/82354040/

The FBI was able to hack the phone of terrorist Farook and his wife recently. The FBI received help from an unknown entity
that gave them access to the contents of the phone. When asked to comment whether they would reuse this same vulnerability
to access information on other phones, the FBI declined to comment. The FBI also did no reveal whether they would inform
Apple about the vulnerability exploited to gain access to the iPhone 5c.