By Al Novack, Steve Beck, Dray Clark

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EGG HARBOR TOWNSHIP, N.J. (CBS) — Dozens of residents have been displaced after a fire swept through a condominium complex in Atlantic County late Wednesday night.

The fire started shortly before midnight at the Heather Croft condominiums along Heather Croft Road in Egg Harbor Township, New Jersey.

Residents said they heard a loud boom that was followed by the sound of smoke alarms going off.

When firefighters arrived, they encountered heavy smoke and flames billowing from the condo complex.

Fire officials say the bulk of the fire was on the 2nd and 3rd floors of the complex and in particular, three condo units. However, authorities say 24 condo units sustained some sort of damage.

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It took firefighters approximately two hours to bring the blaze fully under control.

There were no reports of any injuries to residents. However, a firefighter complained of heat exhaustion and was taken to an area hospital as a precaution.

Fire officials are crediting smoke alarms inside the buildings for alerting residents and allowing them to get out safely.

The cause of the blaze has not yet been revealed.

The Red Cross was on scene providing temporary shelter for approximately 29 displaced residents.

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