What next for Pakistan after Bhutto's death?
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Pakistani officials meanwhile said the government will hold talks with the Taliban after the group announced a ceasefire.
A Taliban spokesman in South Waziristan tribal district said a day earlier that Baitullah Mehsud, the key suspect in the murder of Bhutto, had ordered an indefinite truce.
Hamid Nawaz, the interior minister, said: "There is no announced ceasefire, there is a de facto ceasefire between militants and government troops. Both sides are currently holding the fire."
Nawaz said a tribal council, or jirga "comprising representatives of the government and tribal elders will be formed to negotiate peace but I cannot give you any timeframe in this regard".