Lee Baker from West Midlands Fire Service said that, following further investigations by the fire investigations officer, they have come to the conclusion that the cause of the fire was accidental.
More than a hundred firefighters spent the night tackling the blaze at a furniture warehouse in Sparkbrook, Birmingham.
More top news
Krissoni Henderson from Birmingham was handed a 24 month community sentence which will address his anger issues and a six month curfew.
Six Polish men were found at the two businesses, some living at sites, they are thought to have been paid around £1 an hour.
Tahir Mahmood was detained by Police as he was attempting to climb into the roof space of an out-building at his family’s home.