Rescue workers move a body from the site of a blast outside a public park in Lahore, Pakistan, March 27, 2016.[Photo/Agencies]

Hanif Chanio, a teenager who was stopped at the entrance gate of the hospital by the police, said that his brother took his wife and six kids from a village near Lahore to the park for picnic, but did not reach home after the explosion.

"Please let me go, I have come all the way from my village to search for my brother and his kids, my old father and mother are waiting for them at home, let me see them in the injured, let me see them in the mortuary," Chanio let out a wail while requesting police.

Khwaja Salman Rafique, the adviser to Chief Minister Punjab Shahbaz Sharif, appealed residents to donate blood at the hospital to save the lives of the injured people as scores of them are in critical condition.

The provincial government also provided free rides to those who showed interest in donating blood by calling at the number specified by the officials.

The bomb disposal squad said that the suicide bomber was carrying an estimated eight to 10 kg of explosive materials in his suicide vest.

Personnel from Pakistani army also arrived the park and took its control for investigations.