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Afghan police: Bomb stuck onto private car kills civilian in Kabul

  • Afghans surround a dead man after a bomb exploded under a car, leaving the driver dead, in the center of Kabul, Afghanistan, Monday, Oct. 21, 2013. The Afghan Interior ministry confirmed that it was a magnetic bomb that destroyed the vehicle and killed the driver in the early morning rush hours. (AP Photo/Anja Niedringhaus)

    Afghans surround a dead man after a bomb exploded under a car, leaving the driver dead, in the center of Kabul, Afghanistan, Monday, Oct. 21, 2013. The Afghan Interior ministry confirmed that it was a magnetic bomb that destroyed the vehicle and killed the driver in the early morning rush hours. (AP Photo/Anja Niedringhaus)  (The Associated Press)

  • Afghan police men push people away after a bomb exploded under a car, leaving the driver dead, in the center of Kabul, Afghanistan, Monday, Oct. 21, 2013. The Afghan Interior ministry confirmed that it was a magnetic bomb that destroyed the vehicle and killed the driver in the early morning rush hour. (AP Photo/Anja Niedringhaus)

    Afghan police men push people away after a bomb exploded under a car, leaving the driver dead, in the center of Kabul, Afghanistan, Monday, Oct. 21, 2013. The Afghan Interior ministry confirmed that it was a magnetic bomb that destroyed the vehicle and killed the driver in the early morning rush hour. (AP Photo/Anja Niedringhaus)  (The Associated Press)

  • Afghan's surround a dead man after a bomb exploded under a car, on the right, leaving the driver dead, in the center of Kabul, Afghanistan, Monday, Oct. 21, 2013. The Afghan Interior ministry confirmed that it was a magnetic bomb that destroyed the vehicle and killed the driver in the early morning rush hours. (AP Photo/Anja Niedringhaus)

    Afghan's surround a dead man after a bomb exploded under a car, on the right, leaving the driver dead, in the center of Kabul, Afghanistan, Monday, Oct. 21, 2013. The Afghan Interior ministry confirmed that it was a magnetic bomb that destroyed the vehicle and killed the driver in the early morning rush hours. (AP Photo/Anja Niedringhaus)  (The Associated Press)

Afghan police say a bomb stuck onto a car killed a civilian in downtown Kabul, but that authorities are unclear as to the motives for the attack.

Deputy Interior Ministry spokesman Najib Dunish says Monday's explosion was caused by a magnetic bomb attached to a car as it drove through Kabul.

Dunish says police are unsure if the bomb was planted by insurgents or if it was placed by criminals who had differences with the driver.

Roadside bombs and improvised explosive devices are the top killers of Afghan civilians and security forces.

Insurgents have been blamed for the overwhelming majority of bomb attacks in Afghanistan.