Gelani Farhad, spokesman for the provincial governor, said Saturday another officer was wounded when a police vehicle triggered the explosive in the Adraskan district.
In a separate incident, Farhad said a civilian motorcycle hit a roadside bomb, killing one civilian and wounding another in the Shindand district.
In yet another report from northern Kapisa province, at least nine civilians were wounded when a bicycle bomb exploded in a bazaar, said Qais Qaderi, spokesman for the provincial governor.
Two small children were among the wounded, including one who was in critical condition, he said.