Violence in north, south and east Afghanistan killed more than a dozen civilians and wounded several more.
In southern Afghanistan, a roadside bomb killed 15 civilians and a car bomb wounded five police, in the north a suicide bomber driving a police car wounded nine, and in the east seven men died in a NATO airstrike that sent hundreds pouring onto the streets of Gardez city in a protest that turned violent.
Police and protesters, both armed in a country awash with weapons, fired at each other and burning tyre barricades filled the streets with smoke. Six civilians and two policemen were wounded, said Nader Noori, doctor at the Gardez hospital.
Local officials said an air strike by the NATO-led International Security Assistance Force (ISAF) killed seven road construction company employees overnight.
"The security force ... is currently assessing who the individuals were, why they were armed and why they were in that area at that time of the morning," ISAF said in a statement.
The suicide attack on Saturday was in northern Kunduz province. The attacker drove a police vehicle and targeted an Afghan National Army convoy, wounding five soldiers and four civilians, said Char Dara District Chief Abdul Wahid Omakheil. The Taliban carried out the attack, said spokesman Zabihullah Mujahid.
In southern Helmand province, 15 Afghan civilians were killed on Friday when their vehicle struck a roadside bomb, said provincial spokesman Dawud Ahmadi. "It was a newly planted mine," said Ahmadi, but had no further details.
In neighbouring Kandahar province, a car bomb blast on Saturday near the police headquarters wounded four Afghan police and two civilians, said Zalmai Ayoubi, spokesman for the Kandahar provincial governor. Several police vehicles were destroyed.
According to U.N. figures, 1,271 civilians were killed in the first six months of this year, up by a fifth on the same period in 2009. About 680 troops have been killed so far in 2010, around a third of the number killed since the start of the war.