A three-alarm fire broke out at a Bloomfield apartment along Liberty Avenue Tuesday afternoon.
There were reports of heavy smoke.
Fire investigators confirmed a man fell asleep smoking on a sofa, causing the apartment building to go up in flames.
When emergency crews arrived all three residents inside the building escaped from a back door.
The fire started on the third floor and it was heavily damaged. The second floor had a lot of water damage.
Before crews arrived, there was man who ran inside to rescue people.
He came out of building out of breath.
He talked to firefighters and then drove away.
Neighbors want to know who the mystery man was. Even though no one was inside, they said he was brave and they are calling him a hero.
There was no report of injuries.
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