UPDATE - Fire investigators have ruled a nail salon fire as arson.

Fire crews responded to the O.P. Nail Salon on Montwood shortly after 3 a.m. Monday.  Businesses in the same strip mall as the salon were forced to close their doors temporarily because the water was shut-off while crews cleaned up the debris.

The damage is estimated at $30,000.  Firefighters suspected arson after they found a gas can behind the building after the fire.

The fire marshall's office has not identified any suspects.