Around 10 minutes after takeoff from Joint Base Andrews in Maryland, journalists travelling with the First Lady saw Secret Service officers head to the front of the plane.
A plane carrying US First Lady Melania Trump was forced to turn around and land after the cabin filled with smoke.
They were provided with wet towels to hold over their faces in case the acrid smell became too strong.
The First Lady of the President of the USA was aboard the flight to Philadelphia which was forced to returned to base in Maryland. The smoke and smell slowly dissipated.
A crew member is quoted by U.S. media as saying a "malfunctioning comms unit that had overheated" was the cause of the issue, but the White House has not confirmed this.
It was not immediately clear what caused the problem on the aircraft, a Boeing C-32A identified as "Bright Star".
Trump was seen leaving the back of the airplane after it landed.
Mrs Trump's spokeswoman Stephanie Grisham said "everyone is fine and everyone is safe" following the incident.
Mrs Trump had been due to visit Philly's Jefferson Hospital to meet babies born addicted to opioids.