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US president Barack Obama (C) walks past past two secret service agents towards the Marine One helicopter after disembarking from Air Force One upon his arrival at Schiphol Amsterdam Airport on March 24, 2014 to attend the two-day Nuclear Security Summit (NSS) in The Hague. US President Barack Obama will attend the NSS, where world leaders are expected to pledge to beef up the fight against nuclear terror with the UN atomic watchdog playing a central role, a draft statement ahead of a two-day summit in The Hague showed. AFP PHOTO / POOL / PETER DEJONG