Pakistani President Pervez Musharraf has criticised his Afghan counterpart, Hamid Karzai, saying he is unaware of what is happening in his own country.
Musharraf: 'I am totally disappointed with their intelligence'
Gen Musharraf told CNN that information about the Taleban that Mr Karzai handed him last month was "old and outdated".
He said Mr Karzai had informed him that the fugitive Taleban leader Mullah Mohammed Omar was hiding in Pakistan.
Mr Karzai has rejected the criticisms, saying that intelligence given to Pakistan is up-to-date.
The two countries share a 1,400-mile (2,250km) mountainous border which is extremely difficult to patrol.
Taleban and al-Qaeda elements are believed to be operating on both sides of the border.
Kabul wants Islamabad to crack down on Taleban rebels who launch attacks in Afghanistan. Pakistan denies claims it is lax on militants in border areas.
Gen Musharraf said he was "surprised and shocked" by reports suggesting that Mr Karzai had given intelligence information about the whereabouts and location of Mullah Mohammed Omar in Pakistan.
Gen Musharraf said the Afghan intelligence about the fugitive Afghan leader's location was "nonsense.
"We've already gone through it, this list. Two-thirds of it is months old, and it is outdated, and there is nothing," he told CNN.
"What there was, the telephone numbers that they are talking of, two-thirds of them are dead numbers, and even the CIA knows about it, because we are sharing all this information with them.
"There's nobody there," he said.
Gen Musharraf also said he was "totally disappointed" with Afghan intelligence.
Mr Karzai says at least 150 Taleban are based in Pakistan
"I feel there is a very, very deliberate attempt to malign Pakistan by some agents, and President Karzai is totally oblivious of what is happening in his own country."
Gen Musharraf said there was a "conspiracy going on against Pakistan in [President Karzai's] ministry of defence and his intelligence set up". He said he had passed on this information to President Karzai.
"He better set that right," he said.
Gen Musharraf also rejected criticism that his government was not cooperating with the Afghan authorities to fight Taleban and al-Qaeda fighters.
But a senior advisor to Mr Karzai, Dadfar Spanta, told the BBC that the information given to Pakistan about the whereabouts of Taleban in Pakistan was up-to-date.
The Pakistani authorities had failed to act on similar information presented earlier, he said.
Last month, Afghanistan said it had sent Pakistan a list of 150 Taleban suspects living in Pakistan whom they believe have carried out attacks in Afghanistan.
The Taleban have been blamed for an increase in violence in recent months, including a spate of suicide bombings inside Afghanistan.
Last week US President George W Bush praised Pakistan's role in the war on terror during a visit to the country, but said more needed to be done to defeat al-Qaeda.