A mob of factory employees in eastern Pakistan tortured and burned a Sri Lankan manager on Friday over apparent blasphemy in a "horrific" attack that Prime Minister Imran Khan said brought shame on the country.

A police official in the eastern town of Sialkot, who spoke on condition of anonymity because of the sensitivity of the case, said investigators believed the attackers had accused the manager of blasphemy for tearing down a poster with Islamic holy verses.

"The factory workers...