As battle in Mosul rages on, Iraqi forces bomb ISIS in Syria

The Iraqi army has been fighting for four months to drive the Islamic State out of Mosul, the country's second-largest city. And Iraq's air force has carried out its first-ever air strikes on ISIS positions inside neighboring Syria. Wall Street Journal reporter Ben Kesling, who is covering the conflict, joins Hari Sreenivasan via Skype from Erbil, Iraq.