An east Madison restaurant sustained significant damage in an early morning fire Friday, officials said.
The Madison Fire Department said the fire at Sumo Steakhouse and Sushi Bar on Parkside Drive was kept in check overnight by an automatic fire sprinkler.
According to the report, it's unknown how long the fire had been burning before a passerby called 911 at 2:30 a.m. to report smoke in the area.
A crew went to the roof of the restaurant and entered the building through a hatch, officials said. That's when they discovered light smoke coming from a kitchen vent.
Firefighters pulled an attack line and proceeded to the kitchen, where an automatic sprinkler was holding a fire at bay, according to the report.