Is Israel targeting aid workers?

Israel says it was a mistake and a misidentification.  But how does a powerful military manage to bomb a clearly marked aid convoy in Gaza, killing international aid workers including Australian woman Zomi Frankom?  Today, a long-time aid worker and former World Vision Australia CEO Tim Costello tells us why no one trying to distribute aid in Gaza is safe and what the world should do about it.  Featured:  Tim Costello, executive director of Micah Australia