Angry protesters in Lahore killed two men they suspect of involvement in bombings targeting two churches, that killed at least 14 people.
In other parts of the city, protesters took to the streets, smashing up metro stations and shops.
A faction of the Pakistani Taliban claimed responsibility for the attacks during Sunday services.
In Karachi, Christian protesters said authorities were doing little to stop the bombing.
Christians make up less than two percent of Pakistan's population of more than 100 million.