Afghan officials say attacks across Afghanistan killed at least 13 people on July 26.
In Kandahar province, Taliban militants killed six police officers, including a district police chief, in assaults on some 15 checkpoints.
Dawa Khan Menapal, a spokesman for the provincial governor, said reinforcements later arrived and the combat continued into the night.
Omer Zwak, a spokesman for the governor of the southern province of Helmand province, said a bomb hidden inside a motorcycle killed four civilians and wounded four in Marjah district.
In Kabul, a bomb blast killed an army officer and wounded his driver, while in Herat province, gunmen on motorcycles shot and killed two army officers in the city of Herat.
Based on reporting by AP and AFP