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.

Of the 10 inmates who fled early that morning, five have been recaptured as of May 21 and are being held at the maximum-security Louisiana State Penitentiary.

The escape spread anxiety through one of America’s most beloved tourist cities, opening new wounds for victims’ relatives and forcing some into hiding.