A possible fight at Herald Square subway station in Manhattan caused a panic during the morning rush on Wednesday.
Commuters reportedly fled the station, dropping belongings as they ran from the area. It is still unclear why.
The NYPD reported via Twitter that its officers were on the scene after "reports of people fleeing and calls of a dispute at the location.
Police said "it appears two males were fighting and our officers are investigating."
Few other details were available from officials. A number of reports on social media echoed the confusion, confirming only that people started running out of the station.
Trains were operating normally during the police investigation.
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