“Once they are in, (ISIS) gives them cars to drive, guns, cell phones and cash money,” said one man, who lives in Mosul and has direct knowledge of ISIS recruit efforts.

In Mosul, for example, ISIS recruiting efforts appear to begin at information centers that have been set up around the city.

Pictures of the centers posted online purportedly by ISIS claim to show militants, many dressed head-to-toe in black, distributing leaflets, videos and CDs about their operations to men and boys.

While CNN cannot confirm the authenticity of the pictures, they appear to coincide with descriptions provided by the man who described ISIS recruiting efforts.

The pictures also show men and young boys gathered in front of the centers, watching videos purporting to show ISIS leader, Abu Bakr al-Baghdadi, on giant flat-screen televisions.