Flames broke out early Saturday morning inside the Grammercy Park Apartments, on the 28-hundred block of Hull Road in Camden.
By the time firefighters could begin battling the blaze, flames were shooting through the roof. Firefighters from nearby towns responded to help take on the fire.
Inside, flames entered a bedroom, critically burning a 22-month-old boy. Firefighters smashed windows and rushed inside to get to the toddler. They handed him off to medics, but it was in vain. The boy died at Cooper University Hospital.
The fire left his mother in shock, and his 4-year-old brother with smoke inhalation. Both of them are hospitalized at this hour. Three other people are being treated at the hospital for smoke inhalation and are expected to recover.
Action News is told that two people remain unaccounted for. Firefighters have not reported finding them in the ruins, or somewhere else.
Fire officials say the inferno has been placed under control.
The Red Cross is reporting 18 people need shelter and other assistance because of the fire.
The cause of the blaze is still under investigation.