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Amnesty researcher Mustafa Qadri said he was skeptical because government figures conflict with his group's research and indicate a failure of the state to investigate alleged civilian casualties adequately.
While the Pakistani government regularly criticizes the drone program in public, it has reportedly supported some strikes in secret, according to leaked CIA documents and Pakistani memos published by The Washington Post last week.
Pakistani Prime Minister Nawaz Sharif pressed President Barack Obama to end the attacks when he visited the White House last week, but the U.S. considers the attacks vital to its battle against Al-Qaeda and the Taliban and gave no indication it was willing to abandon them.
A U.N. expert investigating drone strikes, Ben Emmerson, said earlier in October that the Pakistani Foreign Ministry told him at least 400 civilians have been killed by drone strikes in the country since the attacks started in 2004.
Emmerson called on the Pakistani government to explain the apparent discrepancy, saying the figures provided by the Foreign Ministry indicated a much higher percentage of civilian casualties.
"If the true figures for civilian deaths are significantly lower, then it is important that this should now be made clear, and the apparent discrepancy explained," Emmerson said in an email to The Associated Press.
The latest drone strike occurred around midnight Wednesday, Pakistani intelligence officials said, when missiles destroyed a vehicle in Miran Shah, the main town in the North Waziristan tribal area, a major militant sanctuary. No one was killed in the attack, the officials said, speaking on condition of anonymity because they were not authorized to speak to the media.
The Interior Ministry also said Wednesday that "terrorist" attacks have killed 12,404 people and wounded 26,881 others since 2002, although these figures were disputed by some senators. The government has been battling an insurgency by the Pakistani Taliban, which seeks to topple the country's democratic system. It was not clear if the figure involved only attacks on civilians or also those on security forces.
Al Jazeera and The Associated Press