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The Boston Marathon bombing that killed three people and wounded more than 180 was on the same day as the 101st anniversary of the birthday of North Korean founder Kim Il Sung, raising questions among analysts whether Pyongyang, as in some of its past terrorism, used proxies to carry out the attack in the U.S.

North Korea in recent weeks has been threatening the U.S. with attacks, including a pre-emptive nuclear strike. Pyongyang also has a history of committing terrorist attacks without taking credit for them.

President George W. Bush removed North Korea from the U.S. terrorist list as a compromise to the Hermit Kingdom to halt its missile and nuclear weapons development programs.

But a number of analysts say there is a history of a relationship between North Korea and al-Qaida, which raises further concerns since at least one of the two bombs exploded in the Boston Marathon attack Monday used a pressure cooker loaded with ball bearings and nails, which accentuated a low-yield explosive.

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