CN Rail says a train carrying crude oil derailed in northern Ontario, setting off a fire at the site. There are no reports of injuries.

It's the third CN oil train derailment in northern Ontario in less than a month, and the second in the same area.

CN spokeswoman Emily Hamer says the crew on the eastbound freight train reported that cars derailed about 2:45 a.m. Saturday near Gogama, Ontario, about 125 miles (200 kilometers) north of Sudbury.

She says emergency crew are assessing the site and activating an emergency response plan. Photos on social media show a large fireball at the site.

A CN freight train derailed on Thursday east of Hornepayne, and on Feb. 14, 29 cars of a CN freight train carrying crude oil derailed in a remote area south of Timmins, Ontario.