The ATF says they've completed their investigation into the January 24 fire that killed three Baltimore City firefighters.
It was that morning when a vacant home at 205 S. Stricker went up in flames.
Paul Butrim, Kelsey Sadler and Kenneth Lacayo were among the firefighers who responded to battle the blaze.
The privately owned vacant home collapsed, trapping the trio, ultimately killing them.
Their deaths were ruled homicide, as an act of arson was determined to have caused the fire.
Little information has been revealed on any potential suspects.
So far, investigators have only released a 40 second video clip that shows a person near the scene of the fire the night before.
A $100,000 reward was being offered for information leading to that person's identity.