"The government’s application is not moot and the government continues to require Apple’s assistance in accessing the data that it is authorized to search by warrant," the court documents stated, as quoted by the Wall Street Journal.
The iPhone had allegedly been used by a convicted drug dealer, according to the court documents.
Apple has previously refused to cooperate with orders to help the US government unlock the iPhone of terrorist Syed Rizwan Farook, who carried out the December 2 terrorist attack in San Bernardino, California that killed 14 people. The company had cited privacy concerns for its decision not to cooperate.
In March, Apple CEO Tim Cook said the case raised fundamental questions about how much power the US government should have over public privacy and control of data.