Meanwhile, a suicide attack killed 15 people in an eastern province, a NATO spokesman said.
Amrullah Saleh told Parliament the plot to kill Karzai was hatched last month and the gunmen had rented the hotel room they opened fire from 45 days before the attack.
Karzai and other dignitaries escaped unharmed from Sunday's assault during a ceremony in Kabul marking Afghanistan's victory over the Soviet occupation of the country in the 1980s. Three other people, including a lawmaker, died.
Three of the attackers were also killed in a gunbattle with security forces after the assault, Karzai's government said, but the Taliban said three other insurgents got away.
"We had technical information ... that this work would happen," Saleh told a National Assembly session broadcast live on national television. "We passed this information to the national security (adviser) and to the president of Afghanistan."
Despite stringent measures by security services to protect the event, "the result is that we failed," Saleh said.
He refused to give further details about the plot during an open session.
An Afghan intelligence official has said about 100 people were rounded up for questioning after the attack. Some of those questioned have since been freed, officials say. The official spoke on condition of anonymity because he was not authorized to speak to the media.
"Tragically, the attackers succeeded in getting close enough to fire some shots," said a statement issued by William Wood, the U.S. ambassador.
It took authorities two minutes to defeat the attack, Wood said.
Saleh, Defense Minister Abdur Rahim Wardak and Interior Minister Zarar Ahmad Moqbel were summoned to explain to lawmakers what happened Sunday.
All three lost no-confidence votes against them by lawmakers on Tuesday, but not by a high enough margin to press for their ouster.
Daud Sultanzoy, a lawmaker, demanded all three security officials resign
-- although there was no immediate sign that would happen.
The attack in the Afghan capital underscored the fragile grip of Karzai's government in the face of Taliban insurgents.
Secretary of State Condoleezza Rice on Monday said the attack showed Karzai's administration is under a strong threat.
Afghanistan has "determined enemies who will do anything to disrupt the democratic progress that the Afghan people have made," Rice said.
Sunday's lapse brought questions about the readiness of Karzai's government to follow up on its demand for Afghan police and the army to take greater control of security. U.S. and NATO-led troops provide security in much of the country now.
But the White House said it was unfair to criticize Afghan security forces because insurgents had been able to stage an attack.
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"When it comes to dealing with terrorists like the Taliban or al-Qaida, they just have to have even ... a little bit of an impact for everyone to say that they had a big victory," White House press secretary Dana Perino said.
The attack was sure to bring a sense of unease in Kabul, which has been spared the worst of the violence as fighting escalated between the Taliban and international troops.
A suicide attack in the volatile eastern part of the country killed 15 people and wounded 25, a NATO spokesman said.
Maj. Martin O'Donnell said there were NATO troops in the area of the attack in Khogyani district of Nangahar province but there were no alliance casualties.
He said the militants opened up with small arms fire and rocket-propelled grenades before a suicide bomber blew himself up among a crowd that was taking cover.
"If the goal was ISAF they failed," O'Donnell said of Tuesday's violence. He speaks for the NATO-led International Security Assistance Force (ISAF) in Afghanistan. "But if the goal was to injure and kill Afghans they succeeded."
Alliance medics were treating the wounded, he said.
Abdul Mohammed, chief of police criminal investigations in Nangahar, said the bomb went off in front of the office of the district chief who was among those hurt.
He said the attack left 12 dead and 38 wounded. It was not immediately possible to reconcile the differing casualty tolls.
Militants launched more than 140 suicide attacks last year, spearheading their violent campaign against the elected government of Karzai and Western forces that support it.
Violence has intensified since the Islamist militia's ouster from power in a U.S.-led invasion in 2001, killing a record 8,000 people last year, according to the U.N. More than 1,000 people, mostly militants, have died in insurgency-related violence so far this year, according to an Associated Press tally of figures from Afghan and Western officials.
In the past two days, Afghan and foreign troops have killed at least 23 insurgents and wounded 20 others in ground battles and airstrikes in the south and east of Afghanistan, officials said.
[Associated
Press; By FISNIK ABRASHI]
Copyright 2008 The Associated
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