Earlier, the RIA-Novosti news agency, quoting a source in the inquiry, said investigators were looking at engine failure as a possiblecause of the crash.
The Cortland County Sheriff's Office says investigators are looking at every possible clue to determine the cause from mechanical failure to driver actions.
"The attack on ours and other public-facing websites was serious and Martin's intention was to cause as much disruption and failure as possible, " he said.
The Coast Guard said its goal for the investigation is to determine as much as possible about the cause of the tragedy and whether it was linked to equipment or material failure.