The stern comments in Washington came after Afghan leader Hamid Karzai's spokesman said President Barack Obama planned to write a letter acknowledging that American military errors had caused civilian casualties.
"There is not a need for the United States to apologize to Afghanistan. Quite the contrary," US National Security Advisor Susan Rice told CNN on Tuesday.
The State Department also expressed caution on a long-sought bilateral security agreement (BSA), after an official in Kabul said the two sides had reached agreement on key points of the agreement.
Aimal Faizi, Karzai's spokesman, said Obama would write to his boss acknowledging US "mistakes in the war on terror" and the suffering of the Afghan people due to American military operations, as part of the BSA.
But Rice said "no such letter has been drafted or delivered. That is not on the table."
US officials later said the request for a letter had come from Karzai himself during a phone call with Secretary of State John Kerry on Tuesday.
The security agreement could lead to a small group of US troops staying behind after the withdrawal of combat troops in 2014 to train Afghan forces and to mount anti-terror missions.
Officials in Washington said there was still some way to go before reaching a final agreement on the pact, to be put to an Afghan Grand Assembly of tribal chieftains and politicians, known as a "loya jirga" for approval.
Faizi said Tuesday that a major hurdle in negotiations toward an agreement - relating to the issue of whether US troops staying on in Afghanistan would be allowed to search the homes of Afghan citizens - had been overcome.
Faizi said the deal would allow US troops to enter Afghan homes once Nato forces withdraw in 2014 but only in "extraordinary circumstances" where there was an urgent risk to life.
He said both sides had now agreed to the clause on house searches, apparently ending an impasse which had threatened to scupper the agreement.
Faizi said Karzai and Kerry spoke by phone Tuesday during final negotiations for the security agreement which will shape Washington's future military presence in the war-scarred nation.
However officials in Washington said there was still some way to go before reaching a final agreement.
"We're not there yet. There are still some final issues we are working through," said State Department spokeswoman Jen Psaki.
Even if a final agreement is reached, Afghanistan has insisted that the BSA must be approved by a mass gathering of tribal chieftains and politicians.
The four-day grand assembly, known as a "loya jirga" in Pashto, is set to begin on Thursday in Kabul.
The BSA will determine how many US soldiers stay in Afghanistan when most of NATO's troops deployed in the country since 2001 - currently numbering 75,000 - leave at the end of 2014.
The Taliban have branded the loya jirga meeting a US-designed plot, vowing to pursue and punish its delegates as traitors if they approve the BSA.
Highlighting the ongoing security challenges facing Afghanistan, a Taliban suicide bomber on Saturday struck close to the venue where the meeting is set to be held killing a dozen people, most of them civilians.
The issue of legal immunity for US troops who remain in Afghanistan has also held up negotiations. Failure to broker a similar deal in Iraq in 2011 prompted the Americans to pull out completely. The country is now in the grip of some of its worst sectarian violence since 2008.
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It never ceases to amaze me people like @abdussmad think that America is solely responsible for the reign of terror that countries like Pakistan experience daily. The internal problems of Pakistan is just that their incapable security forces are inept to handle the free flow of violence. The so called Pak-Taliban have managed to brain wash the feeble minds of Pakistanis into believing that American is creating the unrest in the country. If any one believes that the drone program continues to successful eliminate the most wanted terrorists without total approval from Pak-Security forces refuses to accept that their trusted leaders are in a direct partnership so Americans can be the bad guy and they pretend to be the outraged good guy. This is a win-win for both countries and only the man on the Pakistani street can moan...groan..complain about drones but the billions entering the country can easily drown that sound!
@Ali Reza don't you think you have it backwards - as usual? Afghanistan, Iraq, Pakistan, Somalia, Yemen should ask God for forgiveness for butchering its citizensby trying to deflect the horrible acts on your fellow citizens you all daily commit do you think it makes you credible By any means?
@Janet Garcia - Texas: Yeah sure keep thinking that. You'll get into more wars if you keep up this attitude. You are doing no one any favours by bombing and invading countries. Until you understand that you are no better than the Taliban you hate so much.
US should get on its knees and beg Afghanistan, Iraq, Palestine, Pakistan, Yemen, and Somalia for forgiveness. Apologize to the world's Muslims for what you have done and how many you killed.
Imagine the nerve of Karzai to want a letter of apology from America? who has spent billions of money & lost lives to make Afghanistan even be recognized as a country on the map. The poppy laden nation where the drugs lords are harvesting untold wealth into their personal coffers like their neighbour Pakistan where the higher ups have an ATM cash machine from America where none of it trickles to the people. But yet in both countries the constant bashing of the hands that feeds them with billions. The only reason Karzai wants this letter to have a ceremonial hoopla to show the elders of Afghanistan that pomp & show is not lost in spite of the immense hardships the people of the country bear on a daily basis. The training of the Afgan security forces of taking uneducated selfish men to train to take care of themselves is a clear example of their neighbour Pakistan where secretarian violence is a daily event where the men cannot even protect their families. What does it say of a nation that daily fails to protect their citizens, please answer that before you continue on your bashing agenda of the WEST!
Should Afghanistan grant US soldiers immunity, the war will continue unabated.