The extraordinary assassination of Ismail Haniyeh

In the early hours of July 31st this year, Hamas leader Ismail Haniyeh was assassinated in the Iranian capital Tehran.
It's presumed Israel was behind the killing, with reports detailing a complex operation by its spy agency Mossad.
So, if it was Israel that did this, why did they do it in such an extraordinary manner, and in Iran of all places?
The answer tells us a lot about the complex political situation Israel finds itself in, where it feels the need for revenge, but only in a way that doesn’t alienate its allies.
Matt Bevan takes a look.