The government had wanted Apple to write a program to help unlock the phone.
Following the San Bernardino shooting, new concerns about domestic threats have risen, but experts say there are ways to prevent those attacks.
All of the 14 fatal San Bernardino shooting victims have been identified.
The FBI announced Friday that it is investigating the mass shooting at a Southern California office party as an act of terrorism, but the agency's director said there is no indication that the slain husband and wife who killed 14 were part of a larger plot or members of a terror cell.
Reporters were given a look inside the Redlands home connected to the San Bernardino shooting suspects Friday morning.
The woman who carried out the San Bernardino massacre with her husband had pledged allegiance to the Islamic State group and its leader on Facebook