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Congress delved Wednesday into the politically explosive issue of unmanned drone attacks, questioning the legality of operations increasingly used to combat al Qaeda and Taliban militants in countries such as Pakistan.

In the eight years of George W. Bush's presidency, unmanned aircraft - or drones - attacked militant targets 45 times.

Since President Barack Obama took office, the numbers have risen sharply: 51 last year and 29 so far this year.
Most attacks have targeted suspected militant hideouts in Pakistan. While the United States is the only country in the region known to have the ability to launch missiles from drones - which are controlled remotely - U.S. officials normally do not comment on suspected drone strikes.

Based on a CNN count, all of the 29 drone strikes this year have hit locations in North Waziristan and South Waziristan, along the 1,500-mile porous border that Pakistan shares with Afghanistan.

Several top U.S. law professors debated the legality of the attacks in a hearing before the House Subcommittee on National Security and Foreign Affairs, the second such hearing held by the subcommittee within the past two months.

"The United States is committed to following international legal standards," said Rep. John Tierney, D-Massachusetts, the subcommittee's chairman. "Our interpretation of how these standards apply to the use of unmanned weapons systems will set an example for other nations to follow."

The four legal scholars invited to testify, however, offered sharply contrasting views of what constitutes an acceptable legal standard. The biggest controversy appeared to surround the legality of strikes conducted by CIA operatives, as opposed to the U.S. military.

"Only a combatant - a lawful combatant - may carry out the use of killing with combat drones," said Mary Ellen O'Connell, a professor from the University of Notre Dame law school.

"The CIA and civilian contractors have no right to do so. They do not wear uniforms, and they are not in the chain of command. And most importantly they are not trained in the law of armed conflict."

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