"The fire has been extinguished, though there are still smoky conditions," the Port Authority's Joseph Pentangelo said just before 12:30 p.m. " There are no injuries. Fire crews are on scene.
"The Port Authority is working with PSE&G to put in place emergency fixes."
The rest of terminal was operating as usual, as were Terminals A and B and AirTrain EWR.
Pentangelo urged travelers to check with their carriers.
An in-ground transformer caught fire just after 11 a.m. on a restricted-access road to Gate 71 at Terminal C, causing the commotion, he said.
Click here to follow Daily Voice Saddle Brook-Elmwood Park and receive free news updates.