ISLAMABAD, Pakistan — A Pakistani Christian woman who was cleared last week of blasphemy charges after spending eight years on death row has been released from prison but remains under government protection because of threats to her life, officials said Thursday.

The woman, Asia Bibi, was released from a prison in central Pakistan and flown to the capital, Islamabad, late Wednesday night, a senior government official said Thursday on the condition of anonymity because of the delicacy of the matter.

One official, however, denied news reports that Ms. Bibi had already flown out of the country. “She is in Pakistan,” said Mohammad Faisal, the spokesman for Pakistan’s foreign office.

Ms. Bibi’s family has appealed for asylum, saying she is in grave danger as hard-line Islamists call for her execution. Her lawyer, Saiful Malook, has already left Pakistan, citing threats to his own life.