A PATH train fire caused delays and multiple lines to be suspended Monday for the morning commute in New Jersey. 

The National Transportation Safety Board said it is investigating after a train caught fire at Newport Station in Jersey City, filling the car with smoke and sending passengers into a panic. 

The fire impacted service between Hoboken and New York City. 

The Journal Square to 33rd Street, Hoboken to 33rd Street and Hoboken to World Trade Center lines were all suspended. The Hoboken to 33rd Street line resumed a short time later, and the other two were back on track by 11 a.m.

NJ Transit, NY Waterway and buses cross-honored PATH tickets for riders seeking alternate routes to and from Manhattan. 

People treated for smoke inhalation at Newport Station

Chopper 2 flew over Newport Station where multiple fire trucks could be seen on the street outside. 

Port Authority officials said the fire started around 6:15 a.m. under an eastbound train at the station. Smoke then filled the train and passengers had to be evacuated onto the platform. 

Video from inside the train showed passengers yelling for the doors to open as smoke filled the car. When the doors opened, flames could be seen coming from under the train and shooting up along the side of the platform. 

One witness said he saw people holding onto their chests and nearly a dozen getting oxygen. He said a couple were taken to the hospital after he saw them holding their chests. 

"I seen about 10 people getting oxygen outside the building, in the front," Eric Robinson said. "It had to be a panic, because I'm surprised nobody got trampled, the amount of smoke they say was inside and everything." 

"I hope they're OK, that's a scary thing to have to deal with in the morning. Getting to work and then you're getting smoked in. I hope they get to the bottom of it," said another person.

Several people were treated for smoke inhalation, officials said.   

Crowded platforms as commuters urged to find alternate routes

At other stations, video showed crowded platforms as commuters received alerts urging them to find alternate routes. 

"I have the PATH app. There was a smoke condition," a rider said.

"I typically used this train to get to work. So now I have to take a cab to get in." 

"I'm glad they did the safe thing of closing down the PATH and making sure everyone was safe. That is very, very scary," another person said.

The cause of the fire is under investigation.