US authorities added the name of the Boston bombing suspect Tamerlan Tsarnaev to a terrorist database 18 months before the explosions, but did not follow up their inquiry.
Officials say the CIA made the request to add Tamerlan's name after the Russian government contacted them with concerns he had become a follower of radical Islam.
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Some 1,000 counter-protesters blocked 500 neo-Nazi demonstrators as they tried to march to the site of the death of Hitler ally Rudolf Hess.
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Local volunteers joined police in pulling passengers free from the wreckage, with some forced to break windows to reach those trapped inside