ISLAMABAD , Pakistan ( CNN ) -- Rawalpindi 's police chief stopped doctors at the hospital where Benazir Bhutto died from conducting an autopsy , according to a lawyer on the hospital 's board . In a video released Sunday , Benazir Bhutto , far right , appears through the sunroof before shots ring out . It was a violation of Pakistani criminal law and prevented a medical conclusion about what killed the former prime minister , said Athar Minallah , who serves on the board that manages Rawalpindi General Hospital . However , the police chief involved , Aziz Saud , told CNN that he suggested an autopsy be done , but that Bhutto 's husband objected . The revelation came on Monday after new videotape of Bhutto 's assassination emerged , showing her slumping just after gunshots rang out . The tape provided the clearest view yet of the attack and appeared to show that Bhutto was shot . That would contradict the Pakistan government 's account . Read Bhutto 's full medical report . A previously released videotape showed a man at the right of her vehicle raising a gun , pointing it toward Bhutto , who was standing in her car with her upper body through the sunroof . He fired three shots , then there was an explosion . In the video that emerged on Sunday , Bhutto was standing , and her hair and scarf appeared to move , perhaps from the bullet . Bhutto fell into the car , then came the blast . Watch new tape showing apparent gunman » . These images seem to support the theory that Bhutto died at the hands of a shooter before a bomb was detonated , killing another 23 people . Doctors at Rawalpindi General Hospital declared the 54-year-old dead hours after Thursday 's attack , but the cause of her death has been widely debated . Pakistan 's Interior Ministry announced on Friday that Bhutto died from a skull fracture suffered when she fell or ducked into the car as a result of the shots or the explosion and crashed her head onto a sunroof latch . See the likely sequence of events » . Bhutto 's family and political party maintain that the government is lying , and insist she died from gunshot wounds . Bhutto 's husband , in an interview with CNN 's Wolf Blitzer on Monday , called for an international investigation into his wife 's death , saying the new video proves the Pakistani government `` has been trying to muddy the water from the first day . '' `` Everything is now very clear that she was shot , '' Asif Ali Zardari said . Zardari also called on the U.S. government to push for an international probe . `` I want them to help me find out who killed my wife , the mother of my children , '' he said of the Bush administration . Javed Iqbal Cheema , spokesman for Pakistan 's Interior Ministry , said the government 's conclusion on Bhutto 's death was based on `` absolute facts , nothing but the facts '' and `` it was corroborated by the doctor 's report . '' But Minallah issued an open letter on Monday and released the doctors ' clinical notes to distance them from the government statement , and he also talked to CNN . In the letter , Minallah said the doctors `` suggested to the officials to perform an autopsy , '' but that Saud `` did not agree . '' He noted that under the law , police investigators have `` exclusive responsibility '' in deciding to have an autopsy . Minallah told CNN that he was speaking out because the doctors at the hospital were `` threatened . '' `` They are government servants who can not speak ; I am not , '' he said . He did not elaborate on the threats against the doctors . He said the lack of an autopsy has created `` a perception that there is some kind of cover-up , though I might not believe in that theory . '' `` There is a state within the state , and that state within the state does not want itself to be held accountable , '' Minallah said . Cheema said the government had no objection to Bhutto 's body being exhumed for an autopsy if the family requested it . Her widower has said the family was against exhumation because it did not trust the government . Minallah said the family could not have prevented an autopsy at the hospital without getting an order from a judge . The three-page medical report , which was signed by seven doctors , described Bhutto 's head wound , but it did not conclude what caused it . It noted that X-ray images were made after she was declared dead . The wound was described as an irregular oval of about 5 centimeters by 3 centimeters above her right ear . `` Sharp bones edges were felt in the wound , '' it read . `` No foreign body was felt in the wound . '' E-mail to a friend . CNN 's Jomana Karadsheh contributed to this report .
NEW : New video proves Bhutto shot , widower says . Doctors claim Pakistani police prevented an autopsy on Benazir Bhutto . Lawyer Athar Minallah said the move violated Pakistani criminal law . Police chief Aziz Saud said he suggested autopsy but Bhutto 's widower objected .