Military analysts say the Sunni rebels are using the experience they have gained in Syria and Iraq to their advantage which explains why they are proving to be a formidable enemy to Iraq's security forces.
Al Jazeera's Imran Khan reports from Baghdad. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website http://www.aljazeera.com
