Pakistan has held 216 suspects after a major sweep by the military and the police saw more than 5,000 detained over the Easter Sunday suicide bomb attack.
Prime Minister Nawaz Sharif vowed to crack down on Islamist militants in the country after the attack in Lahore claimed the lives of more than 70 people, including 29 children.
The death toll from the suicide bomb attack in Lahore has risen to at least 70.
Rescue services spokeswoman Deeba Shahnaz said at least 70 people were killed and about 340 were wounded, with 25 in serious condition.
It was the deadliest attack in Pakistan since theDecember2014 massacre of 134 school children at a military run academy in the city of Peshawar.
Lahore is the capital of Pakistan's richest province, Punjab, and is seen as the country's political and cultural heartland.
Users thousands of miles from Lahore have reported being asked to check in safe following the bombing which killed at least 65 people.
Police say at least 280 other people are injured, and most of the dead and injured are women and children.