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BOSTON – About 200 people evacuated an Orange Line train Thursday morning after it caught fire over the Mystic River, sending clouds of smoke into the air, WFXT reported.

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Some passengers evacuated through smashed windows while one woman jumped into the river to escape the flames, according to WFXT. Officials with the Massachusetts Bay Transportation Authority told the news station that the woman swam to shore and later declined medical help. No injuries were reported.

Video shared by WFXT showed a person running from the train as flames shot from the front car. Officials told the news station that the southbound train was approaching Assembly Station around 6:45 a.m. when it caught fire. Power was turned off in the area while firefighters responded.

John Gosselin told WFXT that he was looking out of his hotel window at the nearby Encore Boston Harbor when he spotted the train.

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“The train stopped and sparks starting coming out of the front, probably about 3 feet behind the driver,” Gosselin said. “I saw a flame and then I knew something was up. … It engulfed very, very quickly. The flames were shooting up. The smoke got very black.”

Video shared on social media showed some of the evacuations.

https://twitter.com/odievk/status/1550102848645566467

It was not immediately clear what sparked the fire. In June, MBTA officials pulled the transit system’s Red and Orange Line trains after an out-of-service car at the Wellington Yard experienced a battery failure, according to WFXT.

On Boston25News.com: Federal transit officials order MBTA to correct 4 major safety concerns

In a report issued last month, the Federal Transit Administration ordered the MBTA to take immediate action to fix issues with the staffing of its Operating Control Center, delayed critical maintenance, lapses in staff safety certifications and general safety operating procedures following a months-long inspection. Last week, MBTA General Manager Steve Poftak said the agency had taken steps to address staff shortages and other issues, according to WFXT.

Authorities continue to investigate.