Thousands of Shi'ite Muslims have rioted in Pakistan following a funeral for victims of Friday's suicide bombing attack that killed 31 people at a mosque.

Witnesses say violence erupted Saturday after thousands of mourners gathered in the city of Sialkot for a funeral for the bombing victims. Rioters set fire to vehicles, government buildings, a police station and the mayor's office, and security forces responded with gunfire and tear gas.

No group has claimed responsibility for the attack. The Law Minister of Punjab Province, Raja Basharat, said it is too early in the investigation to tell whether al-Qaida may have been involved.

Pakistan's Information Minister, Sheikh Rashid Ahmed, says the bombing may have been intended to avenge the death of a terrorist suspect known as Amjad Farooqi, killed in a gun battle Sunday.