Officials say Taliban insurgents killed six Afghan security personnel on February 13 in separate attacks.
Four policemen were killed and seven others wounded in double-suicide attacks at a security checkpoint in the southern province of Helmand, provincial police chief Abdul Rahman Sarjang said.
He said five insurgents equipped with suicide vests were shot and killed by security forces during the incident in the district center, Sangin, where the Taliban have been launching attacks against Afghan Army and police for several weeks.
Mohammad Rasoul Zazi, an army spokesman in Helmand, said one army soldier was killed and another was wounded in the attack.
In Kabul, the outgoing commander of international troops in Afghanistan, U.S. General John Campbell, confirmed the incident but said no American troops were involved.
Meanwhile, another policeman was killed and four others wounded when their vehicle was hit by a roadside bomb in Uruzgan Province, district administration chief Rahimullah Khaliqi said.
The Taliban, which has stepped up attacks on Afghan security forces over the past year, claimed responsibility for the attacks in both Helmand and Uruzgan.