WASHINGTON - A person familiar with the case says Apple Inc. now has until next Friday to respond to a U.S. magistrate's order that it help the FBI hack into an iPhone in a terrorism case.

U.S. Magistrate Judge Sheri Pym's order initially required Apple to file paperwork by Tuesday if it wanted to challenge it for being "unreasonably burdensome."

The person spoke on condition of anonymity to describe ongoing, private legal discussions in the case.

It wasn't immediately clear why Apple was given more time. The publicly available court docket wasn't yet updated to reflect the new schedule.

The Justice Department says Apple could help easily investigators examine the phone.

Apple chief executive Tim Cook contends the demand is dangerous and an overreach of government power.