The derailment of an A Train at 125th Street leaves 34 people injured and causes significant disruptions to the subway system.

MTA chair Joe Lhota said at a press conference Tuesday that the incident occurred at 10:15 a.m. when the train’s emergency brake was pulled resulting in two trains derailing. An investigation into what happened and the extent of the damage continues. Fire officials said that 17 people were being treated at hospitals for non-life threatening injuries .

Several passengers had to be evacuated from trains the were stuck because of the derailment. Train service was also tied up during the morning commute leaving many straphangers stranded or having to look for travel alternatives.

One passenger named Danny told the AmNews the train hit something and he saw sparks fly outside of the window.

“After it hit something we saw sparks,” he said. “Shortly after, we smelled a strong gas smell. Initially people panicked a little bit then and we realized we had to move. We didn’t know if the train was going to catch on fire. They cut the power off to the train and the we saw smoke.”

Danny said passengers pried the train doors open to get to another car, which was pitch black and also had smoke.

“We had no idea where the smoke was coming from,” Danny said. “The MTA workers told us that we were lucky enough that two cars had pulled into the station so we wouldn’t have to trek through the tracks.”

While the derailment caused commotion at 125th Street and St. Nicholas Avenue, the subway system is experiencing service disruptions as a result.

According to the MTA, as of Tuesday evening, A Subway trains are running local between 168 St and 59 St-Columbus Circle, and express between 59 St and Canal St. In Brooklyn, Lefferts Blvd A Subway trains are running local and Far Rockaway A Subway trains are running express; B Subway trains are operating between Brighton Beach and 96 St-2 Ave. C Subway service remains suspended. D Subway trains are running local between 205 St and 59 St-Columbus Circle, and normal between 59 St and Coney Island-Stillwell Ave.