The suspects are facing charges including arson, recklessly endangering another person, conspiracy and causing a catastrophe, the Lehigh County District Attorney's Office announced on Friday.
Crews battle massive fire in Allentown Pa.
"Both juveniles will not be named nor will their ages be provided. Due to the age and circumstances of the offense, these charges must proceed through the juvenile system," the DA's office said in a statement.
Authorities have not revealed further details on the circumstances surrounding the fire.
READ MORE | 'The biggest fire I've ever seen': Massive 6-alarm blaze burns former furniture factory in Allentown
The blaze broke out around 8:45 p.m. Wednesday in the 300 block of North Front Street.
Chopper 6 video showed flames engulfing the entire structure as the fire rapidly intensified.
Authorities said the fire spread across the street to eight homes. Six of those homes were destroyed and deemed uninhabitable, while two others sustained damage. Seven families were displaced.
Fire officials said intense radiant heat, not direct flames, likely caused the blaze to spread.
"It wasn't so much the flames that jumped over as much as it was radiant heat; it was that hot," said Chief Efrain Agosto, Jr., with the Allentown Fire Department. "The heat itself just basically took over."
Drone video shows massive flames as a commercial building burned in Allentown
One firefighter suffered a minor injury while battling the blaze. No other injuries were reported.
The building was the former American Atelier furniture factory, which has since relocated.
Action News has learned that a developer had received approval last year to demolish the property and construct a 16-story mixed-use building with apartments and retail space. It is unclear how the fire may impact those plans.