BOSTON (WHDH) - The northbound side of I-93 in Boston was closed Wednesday afternoon due to a fire in the O’Neill Tunnel, according to MassDOT.

At 4:10 p.m., troopers responded to a report of a fire in the tunnel just before Exit 17, according to the Massachusetts State Police. Upon arrival, they found a burning generator on a trailer pulled by a dump truck.

The troopers began putting out the flames using fire extinguishers until Boston Fire Department arrived to take over, police said.

MassDOT closed a portion of the tunnel while firefighters extinguished the remaining hotspots.

At 4:45 p.m., MassDOT posted on X that the right lane was back open. About an hour later, only one left lane remained closed, MassDOT said in an X post.

The dump truck involved was not damaged and the driver was able to drive it out of the tunnel, according to police.

Crews then treated the roadway with an oil absorbent for a “small amount of fluid that had leaked onto the roadway,” State Police said.

The scene was completely cleared at 5:24 p.m., police said.

Traffic was backed up on I-93 North for hours while authorities were on scene.

This is a developing news story; stay with 7NEWS on-air and online for the latest details.

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