Dutch Police check the ID of a woman at the area of Nuclear Security Summit in The Hague, the Netherlands, March 22, 2014. The third Nuclear Security Summit (NSS) will be held in The Hague on March 24-25. (Xinhua/Yin Gang)

A Dutch military policeman place road block at the area of Nuclear Security Summit in The Hague, the Netherlands, March 22, 2014. The third Nuclear Security Summit (NSS) will be held in The Hague on March 24-25. (Xinhua/Yin Gang)

Dutch military police place road block at the area of Nuclear Security Summit in The Hague, the Netherlands, March 22, 2014. The third Nuclear Security Summit (NSS) will be held in The Hague on March 24-25. (Xinhua/Yin Gang)

Dutch military police place road block at the area of Nuclear Security Summit in The Hague, the Netherlands, March 22, 2014. The third Nuclear Security Summit (NSS) will be held in The Hague on March 24-25. (Xinhua/Yin Gang)

Dutch military police place road block at the area of Nuclear Security Summit in The Hague, the Netherlands, March 22, 2014. The third Nuclear Security Summit (NSS) will be held in The Hague on March 24-25. (Xinhua/Yin Gang)

Dutch Police check the ID of a man at the area of Nuclear Security Summit in The Hague, the Netherlands, March 22, 2014. The third Nuclear Security Summit (NSS) will be held in The Hague on March 24-25. (Xinhua/Yin Gang)