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.
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