A New Jersey Transit train operator was killed and nearly two dozen passengers were injured Monday after a train collided with a fallen tree on the tracks, officials say. 

The fatal incident happened around 6 a.m. on the River Line near the Roebling station outside of Trenton. 

"I have been briefed on an accident on the NJ Transit River Line earlier today in which the light rail struck a tree on the tracks, leading to the death of the train operator and injuring passengers," New Jersey Gov. Phil Murphy wrote on X.  

"An investigation is underway. Our prayers are with all affected by this tragic incident," he added. 

TRAIN COLLIDES WITH MILITARY MOBILE ARTILLERY VEHICLE BEING HAULED ON A SEMI-TRUCK 

NJ Transit tree collision

An NJ Transit River Line train is seen stopped on tracks outside of Trenton, New Jersey, on Monday, Oct. 14, following a collision with a tree. (WTXF)

NJ Transit informed Fox News Digital that "of the 42 customers on board, 23 sustained non-life-threatening injuries, mostly minor."

"The train operator is confirmed deceased. The remaining 19 passengers were accommodated by a bus. New Jersey Transit Police are on scene and investigating," a spokesperson added. 

NEW JERSEY WOMAN LOSES LEG IN TRAIN ACCIDENT, THEN PULLS HERSELF OFF TRACKS 

NJ Transit collision aftermath

The accident on Monday left 23 passengers with non life-threatening injuries, NJ Transit says. (WTXF)

It is currently unclear what caused the tree to be on the tracks. 

"River Line service continues to be suspended in both directions between Trenton and Florence stations due to downed trees across the tracks near Roebling. Substitute bus service is being provided," NJ Transit wrote on X following the incident. 

NJ Transit train strikes tree

Trees are seen strewn across the tracks north of Roebling Station. (WTXF)

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The River Line branch of New Jersey Transit runs between Trenton and Camden.