Three people were hurt when a subway carrying nearly 100 passengers derailed Thursday in Brooklyn, causing delays in both directions on the G Line and prompting service changes that are dramatically affecting Friday's commutes and will affect weekend travel, according to officials.

The MTA said the train's two front wheel's derailed 700-feet north of the Hoyt-Schermerhorn station around 10:30 p.m. Thursday, halting service between Church Avenue and Bedford-Nostrand Avenues in both directions.

The cause of the derailment is unclear, but the MTA said it is investigating the possibility that concrete that fell from a wall contributed to it.

Officials led about 80 passengers through the four-car train and the subway tunnel to the platform at Hoyt-Schermerhorn.

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Passengers posted photos and videos to social media showing straphangers being led from the tracks to the platform, where dozens of police officers, firefighters and MTA workers gathered to investigate.

Three people were taken to Brooklyn Hospital following the derailment. Police say one woman became dizzy due to the heat and two others were being treated for minor injuries.

The cause of the derailment is under investigation.

The MTA implemented a number of service changes Friday and said limited service will continue through the weekend as workers make repairs. Crews hope to have normal service back in time for Monday's morning rush.

The following service changes are in effect: