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At least eighteen people have been killed and several others injured in a series of US assassination drone attacks in Afghanistan over the past three days.

According to the latest reports, six Taliban militants were killed in the northeastern Kunar Province on Sunday. It was the fourth US drone attack over the past three days.

On Saturday, at least ten people were killed as two airstrikes ripped through the eastern Kunar Province near the border with Pakistan.

Two people lost their lives in a similar attack in the Nuristan Province on Friday.

The United States uses its killer drones in a number of countries including Afghanistan, Pakistan, Yemen and Somalia, claiming the targets of the attacks are militants, but local officials and witnesses say civilians have been the main victims.

Afghan President Hamid Karzai has repeatedly questioned the legality of the US drone strikes and on numerous occasions has called on Washington to stop the attacks.

Many civilians have lost their lives in US-led strikes and operations in various parts of Afghanistan over the past decade, with Afghans becoming increasingly outraged at the seemingly endless number of the deadly assaults.

Civilian casualties caused by foreign forces have been a major source of tension between Kabul and Washington.

The United States and its allies invaded Afghanistan in 2001 as part of Washington's so-called war on terror. The offensive removed the Taliban from power, but insecurity remains high in the country.

The United Nations and several human rights organizations have identified the US as the world's number one user of "targeted killings" largely due to its drone attacks in Pakistan and Afghanistan.

The UN also says the US-operated drone strikes pose a growing challenge to the international rule of law.

Philip Alston, the UN special envoy on extrajudicial killings, said in a report in late October 2010 that the attacks were undermining the rules designed to protect the right of life.