The 10 inmates who broke out of a New Orleans jail in a stunning overnight escape last week used electric hair trimmers with multiple clipper blades to help cut their way through the cell walls, a source with direct knowledge of the investigation told CNN.

While the manhunt continued for five New Orleans inmates, another Louisiana inmate escaped a different jail – for the second time.

Former FBI agent Jason Pack calls New Orleans prison break a calculated plan, not "crime of opportunity."