Now they say it's a work of arson. Fire Marshall Sgt. Scott Richardson said an accelerator was found in one of the exits between the second and third floors.
Investigators plan to question more people as they try to determine just who was responsible for igniting the fire.
Tenants were lucky to get out of the building as the fire blocked an exit. Richardson said some residents were able to jump from the third floor to the second floor roof and, then the first floor roof and on to safety.
Investigators said the owner of the tavern is a victim in this case.
When Richardson was asked whether there were any suspects, he said there are still a few people who need to be eliminated before zeroing in on a specific suspect.
We'll continue to follow this story, bringing you new details as they become available.