Police are investigating a subway stabbing thought to have been committed with a hypodermic needle. 

At about 6:50 p.m. Wednesday, a woman was stabbed while waiting for the R train at the 49th Street station, police said. The victim felt a pain in her arm, later determined potentially to have been caused by a needle, as she was bumped from behind by an unknown man. 

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Friday, police released a description and surveillance footage of a man, whom they were seeking in connection with the incident, but later determined was not involved. The investigation is ongoing.

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Anyone with information should call Crime Stoppers at 1-800-577-TIPS (8477) or visit www.nypdcrimestoppers.com.