Sixteen people were hospitalized on Tuesday after a subway train hit an object on the tracks at an Upper Manhattan station, causing a fire that filled the station with smoke, according to fire and transit officials.

A total of 18 people sustained what fire officials described as minor injuries. Two declined medical attention, officials said. The conditions of those who were hospitalized were not immediately clear Tuesday night.

The episode occurred shortly before 1 p.m. at the 191st Street station at St. Nicholas Avenue in the Fort George neighborhood, officials said. The fire was brought under control within an hour, they said.

Service was temporarily suspended on the No. 1 line between 145th and Dyckman Streets as a result of the fire, according to the Metropolitan Transportation Authority.

By Tuesday evening, workers had replaced a rail damaged by the fire, and trains were running in both directions with delays, officials said.

The 191st Street station is 173 feet, or roughly 17 stories, below St. Nicholas Avenue, making it the deepest station in New York City’s subway system. Riders enter and exit via either elevators to St. Nicholas or a 1,000-foot-long tunnel that runs to Broadway.