Canada's Air Transat Flight 942 was flying from Montreal, Canada to Fort Lauderdale in the USA state of Florida and diverted to Newark at around 8:30 a.m. (1330 GMT) after reports of smoke in the cargo hold, according to the Federal Aviation Administration.
The plane landed and all 189 passengers exited using its emergency slides.
The emergency landing shut Newark airport to all arrivals and departures.
Air Transat spokesperson Debbie Cabana confirmed the Boeing 737-800 was forced to land in Newark, NJ due to reports of smoke in the cargo hold. Two people suffered minor injuries not related to the smoke on the plane, according to Coleman.
An Air Transat statement said, "Our 189 passengers' safety is our top priority and they were evacuated promptly upon landing".
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All runways were closed just after 9 a.m. and no flights were getting in or out, according to a message from the Port Authority on the airport's Twitter account, which said flights resumed about 9:45 a.m.
Cabana said nobody was injured, however a Port Authority of NY and New Jersey spokesperson said two passengers reported minor injuries, and one was taken to a hospital to be examined.
While the cause of the incident is still under investigation, the fire seems to have started in the plane's cargo hold, Coleman said.
He said no fire was found but there was a lot of smoke.
Those traveling through the airport are advised to contact your airline for flight status updates. One hundred and eighty-nine passengers were aboard the flight, Cabana said.