Kitchen crew were getting ready for a busy Labour Day Monday lunchtime, she said.
She did not believe anyone was hurt.
For almost an hour after the fire broke out, thick black smoke continued to billow out of the store, while fire crews wore breathing apparatus to enter the building.
While the nearby shops and Cameron St Mall were relatively quiet due to the long weekend, many pedestrians still stopped to watch the fire crews in action.
Radden said a fire investigator would be on scene to determine the cause of the blaze.
Thick black smoke was seen billowing out of the sushi shop but the owner thought no one was hurt. Photo / Denise Piper
Denise Piper is a news reporter for the Northern Advocate, focusing on health and business. She has more than 20 years in journalism and is passionate about covering stories that make a difference.