Train operator on leave after more than 2 dozen people injured in Boston train collision, authorities say

A train operator has been placed on leave after at least 25 people received medical attention when two trains crashed in Boston on Friday, authorities said. No life-threatening injuries have been reported, according to the Boston Fire Department.

The Massachusetts Bay Transportation Authority Green Line trains collided near Agganis Arena at Boston University at about 6:15 p.m., according to the Boston Fire Department.

MBTA spokesperson Lisa Battiston told USA TODAY a two-car train struck another two-car train from behind. She said the employee operating the first car of the train that struck the other one has been placed on administrative leave. The train operator has worked at the MBTA for seven years. Battiston said no other streetcar operators have been placed on leave at this time.

It was not immediately clear what caused the accident, which resulted in damage to the trolleys. Federal investigators from the National Transportation Safety Board will join the investigation into the cause of the crash, the NTSB announced Saturday on Twitter.

"The safety and well-being of our riders and employees is our chief priority," the MBTA said in a tweet Friday night. "We take this matter extremely seriously and are actively investigating the incident to understand what occurred, and prevent it from happening again."

This article originally appeared on USA TODAY: Multiple injured after Green Line trains collide in Boston