Fire officials say they are still trying to determine what caused the fire. Until then, the fire is considered "suspicious."
It took first responders nearly an hour to break into the business and tame the flames. There were no reported casualties, but the fire apparently did significant damage to the building -- the store had been closed and boarded up more than a month.
MoJoe's is owned by 30-year-old Mufid Elfgeeh, who was arrested in May and accused of planning to kill American soldiers returning home. He's being held without bail.
Elfgeeh was taken into custody in a parking lot outside Walmart after attempting to procure firearms and silencers from an FBI informant.
The store where the fire broke out Sunday has previously been searched by FBI agents.