The man was being held for allegedly burning a copy of the Koran in public. The incident took place on the outskirts of Bahawalpur, in Punjab province.
Witnesses said hundreds of people looked on as he screamed for help.
Pakistan's controversial blasphemy law imposes the death penalty for insulting Islam, but it is rarely carried out.
The area where the lynching took place is home to hundreds of madrassas - religious schools - run by radical Islamist or sectarian groups. [BBC] Read more
