"The objectives are for the commission to identify the culprits, perpetrators, organizers and financiers of the assassination," Pakistan Foreign Minister Shah Mahmood Qureshi told reporters Thursday, just after a brief, private meeting with Ban.
Qureshi said Ban would appoint "well-respected, eminent people" to the independent commission.
"We have reached an understanding, and there is a concrete decision on that," the foreign minister said. "What is being discussed and further consultations are required are on the modalities."
Ban's office said in a statement that "broad understanding had been reached" on the nature of the commission, including: how to pay for it; who its members should be; how to protect its independence and impartiality; and that its members should have unfettered access to the information it needs.
Qureshi said he believed Ban had authority without the U.N. Security Council's approval to set up a commission to try to identify the culprits in Bhutto's assassination as quickly as possible. But Qureshi also said some council members he spoke with were supportive of establishing a commission.
"The broad understanding is going to be that it should be done in the shortest possible time, so that we do not want it sort of a lingering thing, going on for years," Qureshi said.
Bhutto died in a gun and suicide bomb attack on Dec. 27 as she left an election rally in the city of Rawalpindi.
Her death shocked the world and Pakistan, fanning revulsion at rising militant violence and theories that Pakistan's powerful spy agencies were involved.
It also helped carry her Pakistan People's Party to victory in February elections. The party has led a fledgling coalition government that has made a U.N. probe into who was behind the killing a top priority.
Qureshi said Pakistan would help as much as possible.
"We have said that we will give unhindered access to sources of relevant information," he said.
The previous government and the CIA quickly accused Baitullah Mehsud, a Pakistani militant commander often blamed for suicide attacks, of orchestrating the killing.
Pakistan's Interior Ministry released a wiretap in which Mehsud associates purportedly congratulated each other for her death. Bhutto had called for Pakistan to redouble its efforts against Islamic extremism.
Bhutto's party has argued that the U.N. should probe the killing, given Mehsud's alleged links to al-Qaida and because of the huge political controversy that surrounds the case in Pakistan.
