Twin explosions in Lahore's Roman Catholic Church and Christ Church in Youhanabad area have left at least six people dead and about 40 injured, a report said.
The attack was carried out by two suicide bombers on Sunday morning when both the churches have high attendance on account of mass, reported the Dawn.
Tehreek-e-Taliban Pakistan (TTP) splinter group Jamatul Ahrar claimed responsibility for the attack.
Youhanabad, the country's biggest Christian locality, is home to about one million people.
The Christian community in Pakistan has long been the target of attacks and hate crimes by extremists.
Two suicide attacks rocked the All Saint's Church in Peshawar's Kohati Gate area last year, killing at least 80 and injuring 100 others.