The Fire and Rescue Service say yesterday's fire at a chippy in Magherafelt was accidental.
They said four fire appliances from Magherafelt, Cookstown, Maghera and Ballymena attended the incident.
A spokesperson said: "The premises was well alight when Firefighters arrived.
"Firefighters used three jets, a thermal image camera and breathing apparatus to extinguish the fire.
"The fire was under control by 10.21am. The cause has been determined as accidental."