Fortifying Diyala province.<br/> <br />Iraqi forces build a wall to keep out fighters from the Islamic state of Iraq and the Levant, or ISIL.<br/> <br />The extremist offshoot of Al-Qaeda has blazed across northern and western Iraq, parading it's weapons through the streets.<br/> <br />It's presented the biggest security threat to the country since the bloodshed unleashed by the U.S.-led invasion to oust Saddam Hussein in 2003.<br/> <br />Washington is watching closely, and has sent U.S. military advisors to help the country fight off the extremist insurgency.<br/> <br />But U.S. President Barack Obama has held off on putting U.S. boots on the ground -- believing that Baghdad can defend itself.
