A Pakistani court has overturned the death sentence of a Christian couple in a blasphemy case, acquitting them for lack of evidence after they had spent seven years on death row, lawyers say.

A lower court had sentenced Shafqat Emmanuel, a watchman at a factory, and his wife, Shagufta Kausar, to death in 2014 for allegedly sending derogatory remarks about the Muslim prophet Muhammad in a text message to another man, Khalid Maqsood.

The couple’s lawyer, Saif-ul-Malook, told Reuters on Thursday the Lahore High Court had acquitted the couple in the case in the central town of Toba Tek Singh.

A detailed order from the court was expected in the next two days, he said.

Prosecution lawyer Ghulam Mustafa Chaudhry told Reuters the prosecution would employ all available remedies against the decision.

Insulting the prophet carries a mandatory death penalty in the predominantly Muslim country. Pakistan’s blasphemy laws have long been criticised by global rights groups.

“Today’s decision puts an end to the seven-year long ordeal of a couple who should not have been convicted nor faced a death sentence in the first place,” Amnesty International’s South Asia deputy director Dinushika Dissanayake said, calling on authorities to provide security to the couple and their lawyer.

The acquitted couple was named in a EU Parliament resolution passed in April that called for stripping the trade exemptions given by the bloc to Pakistan’s exports, saying the country had failed to stem rising blasphemy accusations.

-AAP