Summary: ISIL says it's behind a suicide bombing that killed at least 15 people in Saudi Arabia. As ISIL sharpens its strategy and steps us its attacks in the region, what is the armed group trying to achieve? And can it be stopped? 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
