In the southern Helmand province, Taliban fighters attacked several checkpoints, killing three police and wounding two, said Omer Zwak, a spokesman for the governor. He said 10 militants were killed.
Taliban spokesman Qari Yousef Ahmadi confirmed the attack, saying the militants had captured half of the Sangin district.
In the southern Uruzgan province, a remotely detonated bomb killed three people and gunmen on a motorbike killed one police officer in the southern Kandahar province, authorities said. In the western Herat province, a roadside bomb killed one civilian and wounded another, provincial police spokesman Raouf Ahmadi said.
At night, gunmen attacked a NATO air base on the outskirts of the eastern city of Jalalabad where the U.S. has forces stationed, provincial government spokesman Ahmad Zia Abdulzai said.
Afghan army units told him that a first attack targeted the base entrance, while sporadic gunfire rang out for around a half an hour as helicopters flew overhead, he added, saying he had no information regarding the number of forces involved.
NATO said in an emailed statement that two rockets impacted a base but resulted in no damage to equipment or buildings and no fatalities. The base was later secured, it added.