NEWARK - A passenger plane was forced to make a U-turn after taking off from Newark International Airport because of smoke reported in the cockpit.

United Express flight 4890 eventually made it to Pittsburgh, but it made an emergency landing at around 11:15 a.m. Thursday. The plane stopped on the runway, and 27 passengers were evacuated. No one was injured.

Port Authority spokesperson Steve Coleman says passengers were brought to a conference room and then later taken to a different plane.

No smoke was visible when the plane was brought to the gate, but passengers reported seeing smoke in the cabin.

The agency does not know if there was a mechanical problem. The FAA identified the plane as a de Havilland DH-8, which is a turboprop plane.

The flight left Newark for the second time just before 1 p.m.

The emergency landing was the third aviation incident of varying degrees in as many weeks. The NTSB says a Southwest Airlines jet that crash landed at LaGuardia on Monday with its nose gear hitting the runway first. On July 6, an Asiana airlines jet crashed in San Francisco, killing three.