Coordinated blasts were reported in western Herat province of Afghanistan on Friday night.
A local security official said at least one policeman was killed and four others were injured following the twin blasts.
The official further added that the incident took place around 8:00 pm local time after an explosive planted in a motorcycle went off near a mosque in Islam Qala.
He said the Afghan police forces were inspecting the blast when the second explosion took place that left one policeman martyred and four others injured.
Preliminary reports suggest it was a suicide attack which was carried out in Islam Qala close to Afghanistan-Iran border.
No group has so far claimed responsibility behind the incident.