Days after signing a deal to cut U.S.and Russian nuclear arsenals, President Obama hopes to strengthen global resolve to safeguard nuclear stockpiles and keep radioactive materials out of the hands of terrorist groups and rogue states.

VOA: standard.2010.04.11

By far the biggest worry is that in the chaos engulfing Syria, some chemical weapons might fall into terrorist hands.

ECONOMIST: Syria and its chemical weapons

The UN's resolution 1540 obliges all governments to stop nuclear (and chemical and biological) bomb-making materials falling into terrorist hands.

ECONOMIST: Preventing nuclear trafficking is easier than policing it

There are risks that an Iranian nuclear weapon could fall into the hands of a terrorist organization.

WHITEHOUSE: President Obama at 2012 AIPAC Policy Conference