Passengers and crew have been evacuated from an airplane preparing for take-off at Glasgow Airport after smoke was detected in the cabin.
Jet2 chief executive Ian Doubtfire says an investigation will be carried out into what happened at Glasgow Airport today.
Passengers who were aboard this morning's cancelled flight to Alicante will be offered another flight at 3pm today.
Passenger Jean Walker said some people had to jump from the aircraft wing to the ground.
She said:
It was terrifying.
We were about to take off and the plane started shuddering and there were lights flashing and smoke and the crew started shouting 'Get out, get out'.
She said two women had to jump from the aircraft's wing because there was no escape chute available to her:
We were sitting at the wing and the girl opened the door and we went out on the wing, but there wasn't a chute there.
There were about eight or 10 of us on the wing and I was saying people couldn't come out because there was no chute.
Two girls jumped off the wing on to the ground. They were OK.
Other people got hurt coming down the chutes - they were inflated, but the hostesses were just shouting 'Jump, jump' and people were just banging into each other at the bottom, and about four people were taken to hospital.
The Scottish Ambulance Service said it was treating four passengers for chest and hip injuries.
Strathclyde Fire and Rescue said it sent three appliances to the scene.
Glasgow Airport expect the runway to remain closed for at least another hour following the evacuation of a Jet2 flight this morning.
So far 12 flights have been unable to take off from Glasgow and a number of others have been diverted to Edinburgh.
There are reports of four people being treated for minor injuries, thought to have been sustained when using emergency chutes.
Aircraft passenger Barry Gemmell, who tweeted a picture of the Jet2 aircraft shortly after he says he disembarked, says three people have taken away in ambulances.
A statement from Jet2 said:
This morning's flight LS177 from Glasgow Airport to Alicante made an emergency stop on the runway just prior to take-off.
The aircraft was forced to curtail take-off due to smoke in the cabin.
All 189 passengers have disembarked the aircraft.
A Strathclyde Police spokeswoman said:
We are currently dealing with an ongoing incident at Glasgow Airport involving a 737 aircraft following reports of smoke within the cabin.
Emergency services are in attendance and the passengers have been evacuated as a precaution.
One elderly woman sustained a minor injury leaving the plane.
Inquiries are ongoing.
Passengers and crew were evacuated from a plane preparing for take-off at Glasgow Airport after smoke was detected in the cabin.
The incident happened on a Jet2 aircraft bound for Alicante in Spain at about 7.40am.
One woman passenger received minor injuries as she left the plane.