More than 200 people have been detained in Pakistan in the hunt for those behind the Easter Sunday bombing that killed at least 72 people in Lahore.
Punjab's law minister said those held were among more than 5,000 questioned in a sweeping counter-terror offensive.
Weapons and ammunition have also been seized in raids by security forces.
Taliban splinter group Jamaat-ul-Ahrar said it carried out the attack against Christians celebrating Easter, although most of those killed were Muslims.
The area around Gulshan-i-Iqbal park was more crowded than usual, as members of Lahore's minority Christian community had gathered to celebrate Easter at a funfair there.
At least 29 of the victims were children. Another 300 people were injured, with officials saying they expected the death toll to rise.
"There are no militant safe-havens or no-go areas in Punjab," law minister Rana Sanaullah told a news conference in Lahore.
He said 56 intelligence operations had been jointly carried out by police, paramilitary, army and intelligence forces.
Both Pakistan's prime minister and the powerful army chief have vowed to bring the attackers to justice.
Reports say the military is preparing to launch a new crackdown in Punjab, Pakistan's most populous and wealthiest province - and the heartland of PM Nawaz Sharif's support.
Jamaat-ul-Ahrar's spokesman mocked Mr Sharif on Tuesday, saying that war had "reached his doorstep".
- Christians and Hindus make up the largest minority groups, each representing about 1.6% of the population
- Large population in Karachi but also in the Punjab heartland and the cities of Lahore and Faisalabad, and Khyber Pakhtunkhwa province particularly in Peshawar city
- Majority are descendants of low-caste Hindus who converted under the British Raj
- Most remain poor menial workers, though there are wealthier Christians who came from Goa and are mainly in Karachi
- Attacks, including church and hospital bomb blasts and mob attacks on Christian villages, have increased in recent years; the deadliest involved two bombs at a Peshawar church in 2013 which left around 80 dead
Read more: Who are Pakistan's Christians?