Men mourn the death of their relatives after a blast outside a public park in Lahore, Pakistan, March 27, 2016.[Photo/Agencies]

The army personnel also took part in shifting the injured people to the hospital.

Police found National Identity Card of the suicide bomber near the remains of his body which shows him a resident of Muzaffargarh city of the Punjab province who was born on January 1, 1988.

A heavy contingent of police reached at the bomber's home in Muzaffargarh and arrested 15 people including his two brothers and shifted them to some undisclosed location for investigations.

The government of Punjab announced three-day mourning over the incident whereas the governments in the country's south Sindh and southwest Balochistan province announced one-day mourning.

Both the country's Prime Minister Nawaz Sharif and President Mamnoon Hussain condemned the blast and directed hospital administration to provide best possible medical treatment to the injured people.

Sharif, who was scheduled to leave for U.K. Monday, postponed his visit to review the security situation in the country.