Yousif Stanikzai, an Interior Ministry spokesperson, today said the blast took place in Amna district of the province on 15 November.
Stanikzai said suspected supporters of the ousted Taliban regime had planted the mine. He said two suspects were arrested.
The spokesman said that in a separate attack, a rocket landed Tuesday night near a mosque in Kabul, damaging one its walls. No one was injured in the attack.