The fire started around 1:45 a.m. Monday at the Windsor Commons apartments on Windsor Commons Road in East Windsor.
Firefighters arrived to flames showing from the rear of the three-story building. Crews reported a partial collapse.
The fire was placed under control shortly before 3:30 a.m.
Officials say everyone has been reported safe.
The Red Cross is assisting those displaced.
A cause of the fire is under investigation.
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