At least 15 people were killed and over 80 others wounded when two suicide bombers blew themselves up during prayers at two churches in Youhanabad neighbourhood of Lahore.
The dead toll later rose to 17 as three more people succumbed to their injuries.
The suicide blasts sparked mob violence in the city. The mob smashed vehicles and attacked a city bus station in a rare show of anger following the blasts.
Yesterday, thousands of Christians rioted in Lahore, smashing property and vehicles as they clashed with police in a second day of protests.
The Punjab Government has deployed Rangers at Youhanabad to control violent protesters.
Officials said all entry and exit points of the area have been sealed to avert any untoward incident on the occasion of funerals in the area at around 11:00 am, with thousands of policemen also deployed to safeguard Metro Bus station.