Pakistan's Christian minority have blocked roads and burned tires in protest against attacks on two churches on Sunday which killed 15 people.
Protests are taking place in the eastern cities of Lahore, Faisalabad, Sargodha and Gujranwala.
The authorities are appealing for calm after an angry mob lynched two people suspected of involvement in the attack.
A Taliban splinter group has said it carried out the attacks, the worst on Pakistan's Christians since 2013.
Christian missionary schools around the country are closed as Pakistan observes a day of mourning.
Christians make up a tiny fraction of Pakistan's overwhelmingly Muslim population and are vulnerable to sectarian attacks.