An Afghan policeman has shot dead four of his colleagues at a checkpoint on a remote stretch of a major southern road.
Police in Uruzgan province said another 11 officers manning the checkpoint are still missing.
It is still unclear what happened at the checkpoint, which is located on the road between Kandahar and Uruzgan provinces.
No group has claimed responsibility for the incident.
Afghanistan's police fight insurgents on the front lines, but have fewer resources than the army.
On remote checkpoints they are vulnerable to Taliban attacks.
Authorities want to consolidate the checkpoints into larger bases but have faced resistance from locals who see them as a barrier against insurgents.