A Taliban splinter group says it did the Lahore bombing that killed more than 70 people (and more of the injured are expected to die).
Jamaat-ul-Ahrar said it had targeted Christians celebrating Easter, though police have said they are still investigating the claim.
There were scenes of carnage as parents searched for children amid the debris.
What a glowing advertisement for a religion: We Blow Up Children.
M Ilyas Khan of BBC News Islamabad offers analysis:
The bombing of the amusement park on Easter Sunday was the bloodiest attack on Christians in Pakistan since the 2013 Peshawar church bombing that killed more than 80 people.
But many believe there may be a wider context to the latest attack – 27 March was the deadline set by an alliance of more than 30 religious groups for the provincial government of Punjab to withdraw a new women’s rights law they oppose.
Ah, I see – so on the deadline a “religious group” aims its bomb at women and children playing in a park. “If the government won’t take your rights away, we’ll do it by killing you. Let’s see your fancy ‘rights’ now, bitches.”
And supporters of Mumtaz Qadri, a police guard executed last month for the 2011 killing of a provincial governor who advocated reform of the blasphemy laws, have also launched protests. They brought forward the customary 40th day mourning for Qadri by 13 days to coincide with 27 March and several thousand have now occupied a high-security zone in Islamabad to press demands which include the implementation of Sharia law.
God’s fascists taking over bit by bit.
The explosion, believed to have been carried out by one suicide bomber, hit the main gate to the Gulshan-e-Iqbal park in the early evening, a short distance from the children’s playground.
Officials said the device had been packed with ball bearings.
Read that slowly. Think about it.