With questions raised about the official account of how she died, which has been rejected by Bhutto's aides and supporters, ministry spokesman Brigadier Javed Cheema said the Pakistan government had told the truth.
He added that the government would let the former premier's body be exhumed for inquiry if Bhutto's party asked.
"We do not require the assistance of the international community," he said when asked about calls for an outside probe into her assassination, which has plunged the nuclear-armed Islamic nation deeper into turmoil.
"We understand the environment, the international community does not understand the environment," Cheema told a news conference.
The government said that Bhutto died after banging her head on the sunroof of her vehicle while trying to duck when an attacker came up and started firing before blowing herself up.
It said she had no bullet wounds.
The account has been rejected by her Pakistan People's Party (PPP), and a key aide and witness who washed