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BROOKLYN HEIGHTS, Brooklyn — Hundreds of passengers were evacuated from a train in Brooklyn Sunday morning after the emergency brake was activated and smoke was spotted in a tunnel along the subway line, officials said.

According to authorities, a train on the A and C line was evacuated around 10:30 a.m. at the High Street–Brooklyn Bridge station in Brooklyn Heights.

The MTA told PIX11 that the emergency brakes were activated on a Manhattan-bound C train in the tunnel north of the High Street station around 10:19 a.m. There were 600 passengers on the train when it went into emergency brake mode, according to MTA union officials.

The emergency brakes were activated due to a detached current collector, or the “shoe” that connects the train cars to the electrified third rail, the MTA said.

The FDNY was alerted after the emergency braking caused some sparks which resulted in a small amount of smoke in the tunnel, officials said.

There was another train in the station at High Street, which the MTA discharged and used as a reach train, having passengers aboard the stalled train walk through train cars and onto the second reach train, in order to safely detrain on the station platform, the MTA said.

No injuries were reported from the incident, the MTA and FDNY said.

NYC Transit personnel responded and made repairs to the train in the tunnel. Service resumed at 1:31 p.m., the MTA said.

The cause of the detached part is under investigation, according to the MTA.

Riders should expect residual delays on A and C trains in both directions, especially between Brooklyn and Manhattan.

Earlier in the day, the incident caused both northbound and southbound trains on the line, between Brooklyn and Manhattan, to be rerouted to the F train line, but they have since been adjusted back to their usual routes.

Video from the Citizen App showed multiple FDNY firetrucks on the scene Sunday morning.