Investigators are trying to determine the cause of an early morning fire that damaged a home in Roslyn Heights on Thursday.

Nassau County police said the fire at the home on Donald Street was reported in a 911 call at 4:25 a.m. and all occupants were able to escape without injury.

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Fire officials said only that the cause was under investigation by the fire marshal’s office and police Arson Squad detectives.

Photos from the scene showed flames leaping from a first-floor window in the two-story home, as well as thick black smoke billowing from the structure.

Additional details were not immediately available.