Prosecutors say an investigation of a tugboat grounding on Lake Ontario has led to charges that the man responsible had been posing as a commercial ship pilot.

U.S. Attorney Richard Hartunian say 37-year-old Mark Anselm of Clayton repeatedly claimed that he was properly licensed when he was not. Hartunian says Anselm used a merchant marine license that had been changed to include his name. Anselm is facing a string of federal charges including fraud and identity theft. They carry a possible maximum penalty of 53 years in prison and a $3 million fine. The commercial tug ran aground on June 19, 2012