Pakistan government has denied a UN panel probing the killing of former Premier Benazir Bhutto access to top military officials, including powerful army chief Gen Ashfaq Parvez Kayani.

Former Pakistan President Pervez Musharraf, quizzed last week by a UN panel probing the assassination of Benazir Bhutto, has alleged that her security team had not followed guidelines given by the government for her protection.

A Pakistani court on Monday asked former President Pervez Musharraf and Interior Minister Rehman Malik to appear before it on September 28 for the hearing of a petition alleging their involvement in the assassination of ex-premier Benazir Bhutto as part of an "international" plot.

The independent UN commission charged with examining the facts and circumstances behind the assassination of Pakistan's former Prime Minister Benazir Bhutto formally began its work today.

Pakistan President Asif Ali Zardari thanked the secretary general for accepting Pakistan’s request for conducting a UN probe into the assassination of Benazir Bhutto.

Pakistani Foreign Minister Shah Mehmood Qureshi has said that United Nations would likely to investigate into the assassination of former prime minister Benazir Bhutto.

Pakistani President Asif Ali Zardari may be suppressing the investigation into the assassination of his wife Benazir Bhutto, a British newspaper reported on Saturday quoting members of his own ruling party.

More than 100,000 grieving Pakistanis have thronged the tomb of slain former premier Benazir Bhutto, mourning their beloved leader one year after her assassination.

On the eve of the first anniversary of former Pakistani prime minister Benazir Bhutto's assassination, UN Secretary General Ban Ki-moon on Friday said he supported Pakistan's efforts in finding the truth behind Bhutto's murder.