Police responding to a call on the southbound No. 4 train at 14th Street-Union Square shortly after 9:30 p.m. found the victims. Half of them refused medical attention at the scene; the other half were taken to a hospital and were expected to be OK.

A man released bear spray on a Union Square subway train, affecting eight people, with four hospitalized. Authorities seek a suspect as the NYPD investigates the incident.

The NYPD is searching for a man accused of releasing bear spray inside a train car at Union Square Sunday night.