A suicide blast in Pakistan's southwestern city of Lahore has killed at least 50 people, a health official told CNN.

NBC Montana reports some 200 others were injured, health adviser for Punjab province Khawaja Salman Rafique said.

Officials said the blast was from a suicide bomber, and happened at the city's Gulshan Iqbal Park.

The explosion ripped through the heart of Lahore on Sunday evening, at a time when many families were at the park.

Pakistani Prime Minister Muhammad Nawaz Sharif strongly condemned the blast, expressing grief for the victims.

No group immediately claimed responsibility for the explosion.

More From Newstalk KGVO 1290 AM & 98.3 FM