The man, an Ahmadi Muslim, was tortured until he lost consciousness, The Express Tribune reported Tuesday. Ahmadi Muslims are considered heretics by other Muslims.
The mob broke into a home in the village of Shamsabad in the Kasur district of Punjab province and attacked five family members.
A man, who wasn't identified by Pakistani media for his own protection, was severely beaten until he lost consciousness. His wife and 70-year-old uncle were also beaten.
The man was taken to a hospital where he was said to be in critical condition.
The head of the Ahmadi community in that district, Sheik Yousaf, said he repeatedly asked local police to establish a checkpoint in the area after Ahmadi families had been threatened for the past six months. Police had agreed to the checkpoint, he said, but had been blocked by the local representative of the National Authority.
Yousaf said police deliberately failed to protect the family from the mob.