Firefighters spent hours trying to gain control of the massive blaze, which started just after midnight Wednesday in the 3400 block of Cramer Street.
Firefighters battle fire at Camden apartment building, scene of deadly blaze
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People reported hearing an explosion coming from the third floor.
"We were there an hour. An hour and a half into this fire and out of nowhere, we get this explosion," said Camden City's Fire Chief Michael Harper. "Things were looking good then all of the sudden, the third floor lit off."
Harper watched the video with Action News just hours after everyone on the scene escaped without injuries.
The apartment building is abandoned and boarded up following a deadly fire there on October 25, 2020.
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Two men died in that fire and nine other people were injured.
Police charged a homeless man with first-degree felony murder for intentionally setting the fire.
Homeless man facing murder charges in deadly South Jersey fire
At the time, approximately 20 to 30 residents lived in the building.
A firefighter was injured in the October fire. There were no reported injuries to firefighters in Wednesday's incident.
A cause of this latest fire is under investigation.