Breaking News Update: NY Killers on The Run

From CNN: (Posted at 6:18 p.m. ET)

The cell phone of Clinton Correctional Facility employee Joyce Mitchell was used to call several people connected to prison break fugitive Richard Matt, a source with knowledge of the investigation told CNN on Tuesday. It's unclear who made the calls or when the calls were made. Authorities are trying to determine whether Mitchell, who has not been charged, was aware her phone was being used. Convicted killers Matt and David Sweat were discovered missing Saturday morning from the Dannemora prison in upstate New York.