Barrie firefighters battled a blaze at a rooming house near the city’s downtown.

The fire broke out at 26 Ross Street just before 5:30 p.m. on Saturday.

When firefighters arrived on scene, they were met with flames and heavy smoking coming from the main floor of the house.

Crews entered the home and found a man critically injured inside.

Paramedics confirm to CTV News that the man was taken to Royal Victoria Regional Health Centre with third-degree burns on parts of his body.

Firefighters did a search of the other units inside the house, but no one else was found, and there were no other injuries.

The Office of the Ontario Fire Marshall was called in to investigate because of the injury.

The cause is undetermined and according to Barrie’s Deputy Fire Chief Jeff Weber, it will likely remain undetermined.  Weber says there were a number of fire sources in the unit where the fire broke out, but he doesn’t believe there was any ill-intent.

Damage is estimated at fifty thousand dollars.