The roadside explosion took place in the eastern Nangarhar province's Achin district on Friday. The seven dead included two children and two women, said Ismail Shinwari, the district governor.
No one claimed responsibility for the attack, though the area has seen expanding attacks by an Islamic State affiliate in Afghanistan, known as Khorasan Province.
Earlier, Abdul Marouf Folad, the provincial chief police in western Farah province, said the Taliban on last night attacked a security post in the north of the provincial capital, also called Farah.
No one claimed responsibility for the attack either -- but Taliban insurgents have increased assaults against Afghan security forces across the country.
Earlier this week, they attacked a security post in western Herat province, killing at least 10 policemen there.
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