A suicide bomber killed at least 65 people, mostly women and children, at a park in Lahore on Sunday in an attack claimed by a Pakistani Taliban faction which said it had targeted Christians, Reuters reported.

More than 300 other people were wounded, officials said.

The explosion occurred in the parking area of Gulshan-e-Iqbal Park close to children's swings. The park is a popular site for members of Lahore's Christian community, many of whom had gone there to celebrate the Easter weekend holiday.

Witnesses said they saw body parts strewn across the parking lot once the dust had settled after the blast.

"When the blast occurred, the flames were so high they reached above the trees and I saw bodies flying in the air," said Hasan Imran, 30, a resident who had gone to Gulshan-e-Iqbal Park for a walk.

Officials said 65 people were killed and about 300 wounded. Police Superintendant Mustansar Feroz said most of the casualities were women and children.

The Taliban faction Jamaat-ul-Ahrar claimed responsibility for the attack.

"The target was Christians," a spokesman for the faction, Ehsanullah Ehsan, said. "We want to send this message to Prime Minister Nawaz Sharif that we have entered Lahore."

"He can do what he wants but he won't be able to stop us. Our suicide bombers will continue these attacks", he added.