When detectives asked Collins why he did it, he said he was trying to sleep in the mall and people kept waking him up, which police described as nonsensical.
The incident happened around 5:20 p.m. Sunday at the entrance of the J.C. Penney store, WFTV reported.
Firefighters initially said that an improvised explosive device had been detonated in a corridor next to the store entrance.
The FBI later determined that there was no explosion and no pipe bombs were discovered. It also said that the incident doesn't appear to be terrorism-related.
Police released surveillance video of a man walking through J.C. Penney and an image of another man.
Police told WFTV the composite image is of a second person of interest.
The mall was evacuated. No one was injured, but a ceiling and a wall were damaged by the flares, officials said.
Detectives said they will review surveillance footage recorded at a jewelry store in the mall.
The incident remains under investigation.
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