In December 2015, a man in San Bernadino, California and his wife participated in a terrorist attack that left 14 people dead. In the wake of that attack, the FBI opened an investigation into the couple and ties to other potential terrorists living within the US. An iPhone 5C was discovered that belonged to one of the terrorists, and the FBI

Source: Hot Hardware – Federal Judge Rules FBI Not Required To Disclose Details On Hacked iPhone In San Bernadino Case