Authorities say 55-year-old Warren Harley attacked the three women -- ages 27, 52 and 63 -- inside the 59th Street-Columbus Circle station just after 10 a.m.
The victims were taken to the hospital with minor injuries.
A witnesses alerted a police officer to the suspect, who took him into custody.
Harley was taken to Bellevue Hospital for psychiatric evaluation.
Assault charges are pending.
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