Gaza violence: the weapons involved

We begin in Israel and Gaza, where we are seeing the fiercest fighting in four years. Israeli air strikes have been raining down on the coastal strip, and militants in Gaza have been firing hundreds of rockets across the border. Next, we take a look at the social media war being played out between the two sides. Finally, we take you to Lebanon for a look at the radical sheik whose war-like messages are being increasingly well received by disaffected Sunnis.