When ingenuity and engineering meet in the combat zone -- designs like the Mobile Area Cordon Equipment (MACE) stop.
2nd Angle of Deadly Blast in Egypt
WARNING GRAPHIC: Angle 2 -- Two bombs exploded near a presidential palace in Cairo, killing two policemen in Egypt. The first blast killed one officer and injured three others. The second device blew up as security forces tried to defuse it, killing the other officer. Islamist militants said they had planted bombs in the area last week. The attack coincides with the first anniversary of the mass opposition protests that led to the military overthrowing President Muhammad Morsi.