Karachi, Pakistan ? A suicide attacker detonated a bomb during an outdoor Sunni Muslim prayer service Tuesday, killing at least 41 people and wounding dozens more. In the mayhem that followed, angry mobs torched cars and hurled rocks at police, who fired warning shots in the air.

The attacker blew himself up near leaders of the Sunni Tehrik religious group, which helped organize the prayer service at a downtown Karachi park, police chief Niaz Siddiqui said.

The religious leaders were sitting near a stage erected in front of the thousands of Sunni Muslims marking the birth of Islam’s Prophet Muhammad. Several leaders were killed.

President Gen. Pervez Musharraf condemned the attack and ordered increased security at religious sites, adding that the culprits “will not go unpunished,” according to a statement issued on Pakistan’s state-run news agency.