Passengers on loose in Spain after possible fake emergency landing of Morocco to Turkey plane

12 passengers are in custody after the chaotic incident at Palma Mallorca airport

The flight diverted to Palma de Mallorca’s Airport after a passenger required medical attention. (EPA)

Spanish authorities are investigating the unauthorised disembarkation of 21 passengers from a plane that made an emergency medical landing on the island of Mallorca.

The incident happened when an Air Arabia flight from Casablanca to Istanbul made an emergency landing to attend to an unwell passenger.

When it landed, 21 other passengers forced their way off the plane, prompting security officials to temporarily close the airport.

A government official on the Balearic Islands, Aina Calvo, said 12 people had been detained by police and were in custody.

Those included nine who illegally left the plane, the person who was said to be sick, the person’s companion, and a person who was arrested for fighting with an official on the plane.

Police are still looking for 12 more on the loose.

Investigators are looking at the possibility that the passenger who provoked the emergency landing was not actually ill.

“All fronts (for the investigation) are open at this moment and there is no information that allow us to affirm that it is act of unauthorised immigration carried out in a plot,” Ms Calvo said.

“What is unprecedented is that a person feels sick and 21 people jump onto the airstrip and start running around, because that puts air traffic in jeopardy.”