Officials are still searching for who’s responsible for starting a fire early Friday morning on a subway car that killed the conductor and injured more than a dozen people. The MTA is offering a $50,000 reward for information that leads to an arrest.

The fire broke out around 3 a.m. on an uptown 2 train as it pulled into 110th Street in Manhattan.

There happened to be an off-duty conductor on the train who reported the fire and helped riders evacuate. Photos show the train car totally charred, seats melted, wires dangling. Video shows smoke black billowing out of the grates at street level.

The train operator was found dead, on the tracks.

There were three other fires Friday morning at different stations along this train route; police said the fires likely were connected.