Port Huron City Manager James Freed has reported that his office is actively monitoring a train derailment within the international train tunnel.  CN crews are responding to the incident. Approximately 30 cars are reported to have derailed in various positions and at least one car with dangerous goods was involved. City officials advise residents to avoid the area as they are working with bi-national partners at the scene.  Homeland Security, Emergency Management and regional stakeholders have been briefed. The Port Huron Fire Department is in command on the U.S. side of the tunnel and CN is collaborating with the Municipality of Sarnia and St-Clair County. The cause of the derailment is under investigation. There are no fires or injuries reported.  EBW.TV will keep you informed with updates as this story develops.