North Korea's link to Hamas attack

Pyongyang is known for being transactional and has long been willing to sell weapons to anyone who would pay. Its arms proliferation in the Middle East is well documented. A senior official with the Joint Chiefs of Staff in Seoul says they have evidence of North Korea exporting RPGs and potentially other weapons either directly or indirectly to Hamas; but the cooperation also likely extends to tactical doctrine and training. CNN's Paula Hancocks has the details.