*The full press conference by the National Transportation Safety Board at 5 p.m. Saturday can be watched at the bottom of this article.*

CHICAGO — A federal investigation is underway after a CTA train crash on the city’s North Side left 38 people injured.

A pair of spokespeople for the National Transportation Safety Board (NTSB) held a press conference Friday evening to address local media and provide an update after day one of their investigation.

According to police, a Yellow Line train was traveling south around 10:35 a.m. near the 7500 block of North Paulina Street when it collided with a rail-mounted snow-removal equipment in the Howard Rail Yard.

The Chicago Fire Department reports 38 people were injured and at least 23 were taken to local hospitals — including four children and seven CTA employees. The train operator was among three people who suffered critical injuries. Fifteen people refused treatment at the scene. 

Why was the train and the snow plow on the same tracks? That is the question the National Transportation Safety Board will try to answer. A team of NTSB investigators will begin their on-scene investigation Friday and ultimately determine who was at fault. The final report may not come out for several months.

Just hours after the crash, a man who was onboard the second train filed the first lawsuit against the CTA.

The lawyers — Simmons and Joseph T. Murphy — said 52-year-old Cleon Hawkins was seated in the second car of the Yellow Line train when the collision sent him flying into one of the metal poles in the car, injuring his shoulder and leg.

A second lawsuit was filed Friday morning by a Skokie man who sitting in the first row on the first train car.

The CTA has not yet responded to the lawsuit.

The CTA Yellow Line remains suspended Friday morning and may be suspended up to five more days until the NTSB’s investigation concludes. Shuttle bus services are available between Howard and Skokie-Dempster, serving all affected stations during normal business hours.