Islamabad , Pakistan ( CNN ) -- Pakistani police have revised the cause of a blast that killed 83 people on Saturday , saying a suicide bomber was behind the attack that pulverized a busy marketplace . The explosion targeted Shiite Muslims in Hazara , on the outskirts of the southwestern city of Quetta , authorities said . Police now say a suicide bomber , driving an explosive-laden water tanker , rammed the vehicle into buildings at the crowded marketplace . The water tanker carried between 800 and 1,000 kilograms ( 1,760 to 2,200 pounds ) of explosive material , Quetta police official Wazir Khan Nasir said . Previously , police said explosives were packed in a parked water tanker and were remotely detonated . The blast demolished four buildings of the marketplace , leaving dozens dead and 180 injured . The banned Sunni militant group Lashkar-e-Jhangvi claimed responsibility for the attack , spokesman Abu Bakar Sadeeq told CNN Sunday . The assault left some wondering what could stop the bloodshed in Quetta . Zulfiqar Ali Magsi , the governor and chief executive of Balochistan province , told reporters Saturday that law enforcement agencies were incapable of stopping such attacks and had failed to maintain law and order in Quetta . Pakistan , which is overwhelmingly Sunni , has been plagued by sectarian strife and attacks for years . Last month , two deadly suicide bombings in a predominantly Shiite neighborhood of Quetta known as Alamdar Road killed 85 Shiite Muslims . Police described that double bombing as one of the worst attacks on the Shiite minority . Lashkar-e-Jhangvi also claimed responsibility for that dual attack . According to its interpretation of Islam , Lashkar-e-Jhangvi believes that Shiites are not Muslims . The group believes Shiites insult close companions of Muslim 's prophet Muhammad . Therefore , the militant group believes killing Shiites is a justified in Islam . Families of victims from Alamdar Road protested for several days by laying their relatives ' bodies on a road in Quetta until the federal government dissolved the provincial government and imposed governor rule . Although Balochistan is the largest Pakistani province in Pakistan , analysts and some locals have criticized the federal government for neglecting it , leading to instability . The Shiite community has repeatedly asked for more protection but to no avail . During the Alamdar Road protest , Pakistani Prime Minister Raja Pervez Ashraf met with Shiites in Quetta , Pakistani media reported . He agreed to toss out the provincial government and putting a governor in charge . All administrative powers of the provincial government were given to the governor , who deployed paramilitary forces to maintain law and order in Quetta . Nasir Habib reported from Islamabad , and Holly Yan reported from Atlanta . CNN 's Shaan Khan in Islamabad also contributed to this report .
NEW : The banned Sunni militant group Lashkar-e-Jhangvi claims responsibility . At least 83 people are killed and 180 wounded near Quetta , police say . A suicide bomber drove more than 800 kilograms of explosives into a marketplace . Police : One person is dead.