Huge number of people were present inside both churches on account of Sunday mass.
"Initial reports suggest two suicide bombers carried out the attack," Pakistan's Dawn.com reported.
TTP splinter group Jamatul Ahrar reportedly claimed that responsibility for the attack
Youhanabad houses at least one million people with majority of Christians living in the locality.
"The Christian community in Pakistan has long been the target of attacks and hate crimes carried out by extremist elements," Dawn.com reported.
Following the attack, protests were witnessed across the streets of Lahore, Multan, Faisalabad, Peshawar and Karachi.
