More than 50,000 mourners attended funerals in Karachi, Pakistan, Thursday, for three leaders of a Sunni Muslim group killed in a suicide attack.
Army troops had been deployed in the city to counter demonstrations by youths who torched buses and cars and burned tires in the streets. Many shops in the city were closed.
Young people have been rioting in Karachi since two suicide bombers struck Tuesday during a mass prayer celebrating the Prophet Muhammad's birthday. Fifty-seven people were killed in the attack and about 100 were wounded. No one has claimed responsibility.
Pakistani Prime Minister Shaukat Aziz visited Karachi and met with Sunni leaders in a bid to calm the situation. He has vowed to bring the culprits to justice.
Pakistani President Pervez Musharraf has ordered increased security at religious sites.
Karachi has often been the site of sectarian violence between Pakistan's dominant Sunni and minority Shi'ite Muslims.