The challenges of preventing these acts of terror!
Some of the challenges of preventing these attacks' are trying to secure the materials, how to detect these bombs or the materials they use, the emergency responce, cleanup and public eye communication.
What goes into making these Bombs?
There are two main ingredients to making these bombs, one is 10 kilograms of plutonium, and 10 kilograms of of highly enriched uranium. But since there is over 2 million kilograms of each in girding in the world today making a bomb is easier than ever.