LAHORE, Pakistan — At least 72 people were killed and more than 320 others injured when a suicide bomber targeting Christians blew himself up at a busy park in Lahore on Sunday, officials said.
"Mostly women and children are killed and injured in the blast," Lahore Police Chief Haider Ashraf said, adding that the park was busier than usual as local Christians marked Easter Sunday. "He chose a soft target and that's why went towards women and children in the park."
Many of the victims had lined up to buy tickets for a train ride when the blast occurred. The dead included 36 kids.
Witness Mohammad Arshad told Reuters that he heard the "very loud" explosion.
"I was standing there near the seesaw when the blast occurred," Arshad said. "As we rushed over here we saw a pool of blood and people [both dead and injured] lying here and there."
A splinter group of the Pakistani Taliban — Tehreek-e-Taliban Pakistan Jamaatul Ahrar (TTP-JA) — claimed responsibility for the attack.
"Members of the Christian community who were celebrating Easter today were our prime target," TTP-JA spokesman Ehsanullah Ehsan told NBC News from an undisclosed location while using an Afghan cell number.
He added: "We didn't want to kill women and children. Our targets were male members of the Christian community."
Speaking at the mortuary, rescue worker Pervez Nazir told NBC News that the dead included 36 children. Only 10 were Christian, with the other 26 Muslims.
The State Department called the attack a "cowardly act."
A senior U.S. intelligence official in Washington said that authorities were looking into the TTP-JA's claim of responsibility.
Media footage showed children and women crying and screaming and rescue officials, police and bystanders carrying injured people to ambulances and private cars.
Officials said they had recovered the suicide bomber's body. He appeared to be aged in his mid-to-late 20s. Police said he had carried more than 30 pounds of explosives.
Punjab Chief Minister Shabaz Sharif later announced three days of mourning in the province.
The Pakistani army put out a statement saying it was "resolved that we must bring the killers of our innocent brothers, sisters and children to justice."
Pakistan is a majority-Muslim state but has a Christian population of more than 2 million.
It was the deadliest attack in Pakistan since the December 2014 massacre of 134 school children at a military run academy in the city of Peshawar that prompted a major government crackdown on Islamist militancy.
This story originally appeared on NBCNews.com