Security officials gather at the site of a blast outside a public park in Lahore, Pakistan, March 27, 2016.[Photo/Agencies]

"We claim responsibility for the attack on the Christians as they were celebrating their religious festival," spokesman for the Tehrik-e-Taliban Pakistan, Jamaat ul Ahrar, Eshansullah Ehsan said.

A wounded middle-aged woman was seen running towards the ambulance carrying a badly injured small girl in her arms, asking rescue teams to sift the kid to the hospital.

"She is my granddaughter, I came to park with her father and mother, but I lost them in the explosion, I don't know whether I will be able to see my son and daughter-in-law again or not," the woman said.

After the explosion there was pool of blood at the blast site and people, mostly women and kids rushing out of the park with blood dribbling from their forehead and limbs.

A cell phone with broken screen was found at the site where the incoming call showed "Mother", but its owner was nowhere to answer it.

Police took the phone into custody and informed the worried mother about the situation.