A Christian woman spared the death sentence after her blasphemy conviction was quashed has finally been freed from prison and taken to a secure hiding place in Pakistan, officials have said.

Asia Bibi was flown from her jail in Punjab province to the capital, prompting speculation she was already en route to claim asylum in Europe.

Fearful of a repeat of widespread protests by religious hardliners which paralysed the country after her acquittal last week, the government immediately stressed she remained inside Pakistan.

"Asia Bibi is completely secure at a safe place in Pakistan," foreign ministry spokesman Mohammad Faisal told Reuters.

"Her writ is in court, when that is decided, Asia Bibi can go anywhere she wants to, she is a free national ... if she wants to go abroad, no harm in it."

A British Christian charity in touch with the mother-of-five's family also said on Thursday that they remained in danger.

Mrs Bibi's husband has appealed to a series of countries including the UK to grant his family asylum and European Parliament President Antonio Tajani has invited her and her family to Europe. Matteo Salvini, Italy's interior minister and deputy prime minister, has stressed he will do he would do "all that is humanly possible" to ensure Mrs Bibi and her family are safe.