At least 11 people were killed as a bomb blast rocked a public rally in the southwestern Pakistani city of Quetta late on Tuesday, media reports said.

According to a Government official, Hamza Shafaat, the rally was held to commemorate the anniversary of the death of Sardar Ataullah Mengal, a nationalist leader and former provincial chief minister.

His son Sardar Akhtar Mengal, who was in attendance, is safe, Shafaat said.

He said about 30 people were injured in the incident.

As per reports, the bomb went off in a parking area as the people were leaving the rally.

The blast appeared to be a suicide bombing, police said.

No one has claimed responsibility.

Quetta is the capital of restive Balochistan province, which borders Afghanistan and Iran.

Both Islamist militants and Baloch separatist insurgents operate in the region.