Chad and Niger launch offensive against Boko Haram

The armies of Niger and Chad have launched a "ground and air" offensive against the Boko Haram armed group in northeastern Nigeria. Al Jazeera's Ahmed Idris reports from Abuja. More on our website: http://aljazeera.com Follow us on Twitter:   / ajengligh   Subscribe to our channel: http://bit.ly/AJSubscribe Find us on Facebook:   / aljazeera