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A suicide car bomber attacked a NATO convoy in Kabul Tuesday, killing at least 18 people, including six NATO soldiers -- five Americans and one Canadian.
The bomber detonated his explosives near several government buildings during morning rush hour in the capital. The blast destroyed more than a dozen military and civilian vehicles, including a bus.
The Taliban claimed responsibility for the attack.
Afghan officials say 12 civilians were killed and at least 47 others wounded in the blast, including women and children.
NATO Secretary-General Anders Fogh Rasmussen condemned Tuesday's attack and said the alliance remains committed to its mission to protect the Afghan people and strengthen Afghanistan's ability to resist terrorism.
Afghan President Hamid Karzai also condemned the attack, the deadliest against foreign troops in Kabul since six Italian soldiers were killed in a suicide bombing last September.
In a separate attack, NATO says one of its soldiers was killed Tuesday in a bomb explosion in southern Afghanistan.
In the eastern province of Paktia, Afghan officials say police shot and killed a suicide bomber who tried to attack a local government building on Tuesday. The attacker's explosives detonated and at least one police officer was killed.