Police said a district governor and three others were killed on June 14 when their vehicle struck a roadside bomb in northeastern Afghanistan.
A provincial police spokesman said Hamidullah Haqjo, the governor of Ishkamesh district of the Takhar Province, as well as a police officer and two of his bodyguards were killed in the incident, which occurred in the early morning.
He said the governor was going to visit security checkpoints in the remote areas of the district, which came under an insurgent attack the previous night.
The Taliban claimed responsibility for the blast.
The Taliban's insurgency has spread in recent months from its strongholds in the south to northern Afghanistan.
Meanwhile, police in southern Kandahar Province said a roadside bomb killed a woman and wounded three people in the province's Khakrez district.
In western Farah Province, officials said on June 14 that at least one civilian was killed and three others wounded in clashes between government forces and insurgents in the province's Posht Rod district.