But Mr Khatami's hardline rivals in the Iranian leadership may not approve his unequivocal support for Mr Karzai.
"Afghanistan is committed to fighting it, because this evil is hurting us, " Karzai said.
"Karzai and Bush will have responsibility for whatever happens to the hostages, " Ahmadi said.
U.S. President Barack Obama apologized to Afghan President Hamid Karzai in a personal letter.
President Karzai and I also discussed the nature of our security cooperation after 2014.
WHITEHOUSE: President Obama and President Karzai Hold a Press Conference | The White House
Records filed by the Karzai campaign indicate that it raised and spent roughly two million dollars.
Karzai summoned Abdul Qadir Fitrat, the governor of the Central Bank, to the palace.
Waheed Omar, Afghan President Hamid Karzai's spokesman, also added that Mr Fitrat was himself under investigation.
Mr Karzai has cancelled a scheduled press conference with visiting US Defence Secretary Chuck Hagel.
BBC: Hamid Karzai says US and Taliban sowing post-2014 fears
Later that evening, the Secretary-General met the President of Afghanistan, Hamid Karzai.
"We have spent it in different areas (and) solved lots of our problems, " Karzai said.
The elections are a critical moment for Afghanistan as President Hamid Karzai's five-year term ends.
In Washington, Secretary of State Hillary Clinton said she expected to hear Tuesday from Karzai.
And I know that President Karzai has come here saying that he is in Pakistan.
In recent weeks Mr Karzai has created unwanted turmoil, for the second year running.
Meanwhile relations between Mr Karzai and his international backers have dipped to yet another new low.
On this day last year, Vice President Biden was in Afghanistan meeting with President Karzai.
Of course, President Karzai and I both acknowledge that much more work needs to be done.
WHITEHOUSE: President Obama and President Karzai Press Availability
The result left Karzai short of the 50 percent need to avoid a runoff.
It was President Karzai's first meeting with Pakistan's new Prime Minister, Raja Pervez Ashraf.
Mr. Karzai said nine of the 16 fatalities were children and three were women.
The U.S. military supports Karzai's efforts, and that any reconciliation must be Afghan-led, the official said.
Karzai agreed to the November runoff election after intense diplomatic arm twisting by the United States.
CNN: Afghan election official opposes presidential coalition
He argued that the commissioners cannot be impartial because of their bias toward Karzai.
CNN: Afghan election official opposes presidential coalition
"I have not had strained relations with President Rabbani in the past, " Karzai said.
Yes there are lots of problems with Karzai, but we don't have any other options.
Recently Karzai said the election irregularities were due to foreigners seeking a "puppet government" in Afghanistan.
The Obama administration's concern was heightened last year by questions about the integrity of Karzai's re-election.
Mr. Karzai Sunday sent a delegation of senior government officials to Panjway to investigate the killings.
Assessing progress in his own country, Karzai said things were improving despite ongoing violence.
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