The incident was reported at West 35th Street and 8th Avenue around 2:30 p.m. Friday afternoon.
The FDNY said a victim was taken to Bellevue Hospital in unknown condition, but she is not believed to be seriously hurt.
Crews had been working underground nearby and a witness said the woman fell about 5 feet down when the cover over the sidewalk gave way.
Few other details were released, but the investigation is ongoing.
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