ISLAMABAD- Prime Minister Nawaz Sharif on Wednesday strongly condemned the brutal murder of a Christian couple in KotRadhaKishan and termed it "an unacceptable crime".

"A responsible state cannot tolerate mob rule and public lynching with impunity," Prime Minister Nawaz said according to media reports.

"I have directed Punjab Chief Minister to show no mercy and law should take its course to punish those who are responsible for this act," the premier remarked.

The Prime Minister said Pakistani state has to act pro-actively to protect its minorities from violence and injustice and to promote inter faith harmony among various religions.

According to police, an enraged mob had beaten a Christian couple to death and burnt their bodies in the brick kiln where they worked for allegedly desecrating a copy of the Holy Quran.

The incident took place in KotRadhaKishan, a town some 60 kilometers southwest of Lahore, and was the latest example of mob violence against minorities accused of blasphemy.

Punjab Chief Minister Shahbaz Sharif has constituted a three-member committee to fast track the investigation of the killings and ordered police to beef up security at Christian neighborhoods in the province, an official from his media office said.