KABUL, Afghanistan — An Afghan official says a bus that took a detour to avoid one roadside bomb instead hit another in a central province, killing seven people, including three children.

Assadullah Ensafi says the explosion occurred in the Muqur district of Ghazni province on Tuesday morning. He says 17 people were injured in the explosion.

Ensafi, the provincial deputy police chief, says the bus was heading to Kabul from southern Helmand province.

It took a detour through a desert area because the road it would usually take was closed so NATO troops could defuse a bomb.

Also Tuesday, a suicide car bomb went off in front of an Afghan National Army security post in Logar province's Khushi district.

Deputy police chief Rais Khan Abdul Rahimzai says the explosion wounded four Afghan soldiers.