A flight full of passengers was forced to make an emergency landing at Heathrow Airport shortly after take off after a "strange smell" was reported.
Reports suggest pilots on the British Airways flight made the decision to return the aircraft - which had departed to Nice - back to the airport after members of staff reports fumes.
Flight trackers showed flight BA 348 landed at Heathrow and was delayed following an emergency.
A spokesman for the airline confirmed the plane returned to the airport after a technical issue, with passengers now waiting on a replacement aircraft.
They added: "The aircraft landed normally after returning to Heathrow following reports of a technical issue.
"The safety of our customers and crew is always our priority."
BA added it was attempting to find affected passengers a replacement aircraft to continue the journey to south France.
The exact nature of the technical issue is currently unknown.
A spokesman for Heathrow Airport confirmed the plane made an unscheduled landing with emergency crews standing ready.
They added: "The incident has now been stood down."
One passenger reported "strange smells" on board the flight, added the pilots were seen wearing oxygen masks.
They tweeted: "Current pax and happen to be. A a320 pilot. Definitely strange smells. Pilots on oxygen masks.
"Back to gate, fire dept surrounding but no intervention. Pilots still on oxygen.
"Capt PA: Attaching airbridge, normal disembarkation."
It comes after a BA passenger opened opened up about her nightmare flight as she was left stuck on a plane for hours after the engine froze.
Dr Aine O'Brien, 32 claimed passengers were left with a lack of provisions, and people struggled to keep their children entertained as the plane sat on the tarmac in freezing conditions.
She was trying to fly home to London from Glasgow to attend her fiend's wedding, when she was left trapped on a plane for five hours after the engine and the de-icer machine both froze.
Last Wednesday, December 14, the 32-year-old hoped that by getting a plane to attend the nuptials, after her train was cancelled due to strikes, would be the quickest way home.
But she was struck down with bad luck for the second time in a week, after her flight was cancelled the previous day.
