Joint operations by Afghan forces and Nato-led foreign troops have killed 64 civilians in Kunar province, including women and children, over the past four days.
"They were killed by ground and air strikes in Ghazi Abad district," Fazlullah Wahidi, governor of Kunar province, said today.
He said 20 of the dead were women, 29 were children or young adults aged 7 to 20, and the remaining 15 were adult men.
Civilian casualties in Nato-led military operations, often caused by air strikes and night raids, have long been a source of friction between the Afghan government and its Western partners.
Rules governing air strikes and night raids have been tightened significantly by Nato-led forces in the past two years, leading to a sharp drop in civilian casualties caused by such incidents.
Mistakes still occur, although UN and other figures show that insurgents cause at least three-quarters of the civilian casualties in Afghanistan.
A spokesman for the Nato-led International Security Assistance Force (ISAF) said they were investigating media reports seven civilians may have been wounded in operations in Kunar but were not aware of any reports of civilian deaths.
ISAF said on Friday that more than 30 insurgents had been killed in an overnight mission in Kunar. It said that operations had been going on in Ghazi Abad since February 16th.
Another ISAF statement today said it had engaged an "unknown number of insurgents" in two separate operations and attacked with small-arms fire and air strikes. Both statements said initial reports indicated no civilian casualties.
Videos taken by Reuters television in a hospital in the provincial capital, Asadabad, showed two children being treated for leg wounds alongside two wounded women.
"There has been ongoing operations in different parts of Ghazni Abad for the last three days," said a man who identified himself as Ibrahim, a resident in Elgal village in Ghazi Abad. He said "bombardments" had killed 12 men, about 30 children and 10 women. Another villager, Farhad, said 62 civilians had been killed.
A United Nations report late last year found that civilian casualties in Afghanistan rose 20 per cent in the first 10 months of 2010 compared with 2009, with more than three-quarters killed or wounded by insurgents.
The report found that there were 6,215 civilian casualties in the period, including 2,412 deaths. Those caused by Afghan and foreign "pro-government" forces accounted for 12 per cent of the total, an 18 per cent drop.
Other rights agencies have since documented similar figures.