Officials say casualties occurred after militants struck military checkpoints in at least three northern provinces.
The Taliban claimed they were behind a fatal roadside bombing in northern Kunduz province, that had killed the US soldier. A Taliban spokesman even tweeted a purported photo ID of the slain US soldier, without saying how it was obtained.
"At around 5 pm this evening a mine planted by the Taliban terrorists hit a civilian car ... killing 15 civilians and wounding two more," says Nasrat Rahimi, an Interior Ministry spokesman.
Heavy fighting has been going on in Kunduz city after the Taliban fighters mounted attacks from several directions on Friday night.
The Taliban effectively control nearly half of Afghanistan and have continued to launch daily attacks on security forces despite holding several rounds of peace talks with the United States in recent months.
Taliban fighters have killed 12 more Afghan troops in the siege of a government building that has continued into its second day.
The Greek island camp is full of Afghan refugees, who spend their days in what they say is "filth and degradation".
Officials say the fighters set fire to a government building in central Wardak district and killed the district police chief along with nine other policemen on Saturday night.
A look into the lives of Afghans who took refuge in Turkey after fleeing the deadly war back home.
Nearly 150 people abducted by Taliban in an ambush in northern Kunduz province have been rescued.
The Taliban spurned an Afghan government offer of a three-month-long ceasefire on the grounds it would only help the US-led mission.
Thirty-six people, 30 of whom were children were killed in the attack in which rockets and heavy machine gun fire was used on the madrasa in Kunduz, according to the UN investigation.
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