The victims of the blast in Kandahar's Maroof district "were going from Maroof district center to their village when a newly planted Taliban bomb hit their car," said Zia Durani, a spokesperson for Kandahar police.
The southern province of Kandahar has long been a Taliban stronghold. Durani provided no evidence to support the assertion of Taliban responsibility.
The group has not claimed the attack.
Roadside bombs have been responsible for about 18% of civilian casualties this year, according to the United Nations.
Nearly 500 people were killed by improvised explosive devices between January and September.
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