(reuters)
A U.N. investigator has called on the Obama administration to justify its policy of assassinating rather than capturing al Qaeda or Taliban suspects, increasingly with the use of unmanned drone aircraft that also take civilian lives.

Christof Heyns, U.N. special rapporteur on extrajudicial, summary or arbitrary executions, urged Washington to clarify the basis under international law of the policy, in a report issued overnight to the United Nations Human Rights Council. The 47-member Geneva forum is to hold a debate later on Tuesday.

The U.S. military has conducted drone attacks in Afghanistan, Iraq, Pakistan, Somalia and Yemen, in addition to conventional raids and air strikes, according to Heyns, a South African jurist serving in the independent post.

"Disclosure of these killings is critical to ensure accountability, justice and reparation for victims or their families," he said in a 28-page report.

"The (U.S.) government should clarify the procedures in place to ensure that any targeted killing complies with international humanitarian law and human rights and indicate the measures or strategies applied to prevent casualties, as well as the measures in place to provide prompt, thorough, effective and independent public investigation of alleged violations."

Citing figures from the Pakistan Human Rights Commission, he said U.S. drone strikes killed at least 957 people in Pakistan in 2010 alone. Thousands have been killed in 300 drone strikes there since 2004, 20 percent of whom are believed to be civilians.
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