ISLAMABAD , Pakistan ( CNN ) -- Benazir Bhutto died from a fractured skull caused by hitting her head on part of her car 's sunroof as a bomb ripped through a crowd of her supporters , a spokesman for Pakistan 's Interior Ministry said Friday . Members of Bhutto 's Pakistan People 's Party in the northwestern city of Peshawar protest her assassination . `` When she was thrown by the force of the shockwave of the explosion , unfortunately one of the levers of the sunroof hit her , '' said spokesman Brigadier Javed Iqbal Cheema . The explanation is the latest from the Interior Ministry . It initially said Bhutto was killed by shots fired by the bomber , and then , via the state-run Associated Press of Pakistan , it said the cause of death was a shrapnel injury . But Farzana Raja of Bhutto 's Pakistan People 's Party told CNN the government 's explanation is `` a pack of lies , '' she told CNN . Raja also accused the government of a `` total security lapse . '' At a news conference , Cheema showed images of Bhutto in a car , standing up through an open sunroof , looking out at the crowd as she was about to be driven away . When the gunshots rang out and the explosion occurred , Bhutto `` fell down or perhaps ducked '' and apparently hit her head on a lever , Cheema said , adding that the lever was stained with blood . Watch the shots , then a blast » . The blast killed at least 28 more people and at least 100 were wounded . The Interior Ministry also revealed Friday that it had proof showing that al Qaeda was behind Bhutto 's assassination . Cheema said the government had an intelligence intercept in which an al Qaeda militant `` congratulated his people for carrying out this cowardly act . '' However , that claim has not appeared on radical Islamist Web sites that regularly post such messages from al Qaeda and other militant groups . The Interior Ministry told Pakistan 's GEO-TV that the suicide bomber belonged to Lashkar-e-Jhangvi -- an al Qaeda-linked Sunni Muslim militant group that the government has blamed for hundreds of killings . U.S. officials believe that a Taliban leader , Baitullah Mahsud , may be the person behind the assassination . Bhutto was laid to rest in a chaotic funeral at her ancestral home of Garhi-Khuda Baksh on Friday after violent scenes erupted across Pakistan following her death a day earlier . Watch video from Bhutto 's funeral procession » . Hundreds of thousands of people in the surrounding streets almost brought the procession to a standstill before it finally reached the Bhutto family 's mausoleum . The throngs of her grieving supporters crushed up against the flag-draped coffin , while minor scuffles also broke out . See images of Pakistan mourning Bhutto . » . Violence erupted in Pakistan in the hours before Bhutto 's funeral started , with at least nine people reported killed and banks , train stations and cars torched . Bhutto 's body arrived in the hours before dawn at Garhi-Khuda Baksh after a long journey by plane , helicopter and ambulance . The opposition leader 's family -- her husband Asif Ali Zardari and three children -- accompanied the body aboard a Pakistani Air Force C-130 transport plane to Sukkor but traveled by bus from there to Larkana and on to Garhi-Khuda Baksh . Another former prime minister , Nawaz Sharif , told CNN on Friday that he had planned to attend Bhutto 's funeral , but was advised not to by Zardari , who cited security concerns . The prime minister 's office has launched a judicial inquiry and the Ministry of the Interior is setting up a police inquiry , according to Information Minister Nisar Memon . Memon said no decision had been made to postpone parliamentary elections scheduled for January 8 . Bhutto , who was campaigning for the elections , had completed an election rally and was leaving the rally site , Rawalpindi 's Liaquat Bagh Park , at the time of the attack . What impact could Bhutto have had in Pakistan ? » . Her father and former prime minister , Zulfiqar Ali Bhutto , was hanged in the same northern city in 1979 . As a shocked Pakistan absorbed the news of Bhutto 's death , authorities called for calm and asked residents to stay inside . In Sindh province , where Karachi is located , police said demonstrators had burned a dozen banks , set two train stations on fire , along with three trains . Since Thursday , 240 vehicles have been burned . Because of the violence , paramilitary forces in Sindh were told to `` shoot on sight '' anyone causing civil disturbances , a spokesman for the Pakistan Rangers said . But by Friday morning , Pakistani media reported an uneasy calm had spread across the shaken country , now marking a three-day period of mourning declared by President Pervez Musharraf . Bhutto led Pakistan from 1988-1990 and 1993-96 , but both times the sitting president dismissed her amid corruption allegations . She was the first female prime minister of any Islamic nation . A terror attack targeting her motorcade in Karachi in October killed 136 people on the day she returned to Pakistan after eight years of self-imposed exile . Bhutto had been critical of what she believed was a lack of effort by President Musharraf 's government to protect her . View timeline » E-mail to a friend .
Benazir Bhutto died after hitting head on car 's sunroof , Pakistan government claims . Former prime minister earlier claimed to have died from bomb shrapnel or bullets . Pakistan People 's Party official says government claims are ` ` pack of lies '' Pakistani government names Taliban leader as suspected plotter .