The cause of a large brush fire near the American end of the St. Clair Rail Tunnel late Sunday afternoon remains unknown.
The blaze broke out just after 4pm near 10th St. and Johnston St. within a fenced area around the tracks.
The Port Huron Fire Department says it was able to extinguish the flames within the hour, leaving a large scorched area.
No injuries were reported.
Brush Fire near CN train tunnel in Port Huron April 22/18. Photo courtesy of Port Huron Fire Dept. via twitter.
Brush Fire near CN train tunnel in Port Huron April 22/18. Photo courtesy of Port Huron Fire Dept. via twitte