Two men escaped from a fire in a house on Thunder Bay's south side late Monday night.

Firefighters were called just after 11 p.m. when a fire broke out at 129 South Marks Street.

The fire service said the fire was in the back-porch area, and had also spread up the outside wall, melting the siding.

A man in an upstairs apartment and one in a main-floor unit managed to get out, but firefighters had to rescue two cats.

It took crews two hours to put out. The cause of the fire is being investigated.