Update: EasyJet flight #U28626, travelling from Palma de Mallorca to London Gatwick, has landed safely at Paris Orly after having declared an emergency.
The flight - EZY8626 - was diverted because of a medical emergency on board.
EasyJet has issued a statement confirming the cause of the incident.
It said: "Unfortunately due to a passenger welfare issue your aircraft has been diverted to Paris Orly. Once our team on the ground has assisted the passenger we plan to refuel and continue to London Gatwick.
"We apologise for any inconvenience this may cause."
The plane is now scheduled to depart Paris Orly at 3:35pm and will arrive in Gatwick at 3:45pm. It had originally been scheduled to arrive at 1:35pm.
The plane diverted at around 1:20pm, having squawked 7700, the air traffic control code for an emergency. The plane descended rapidly, according to various tracking sites including AirLive.net, before holding steady at around 11,000 ft as it entered the Paris airport.
Various sources tweeted the incident as it happened.
Easyjet flight U28626 squawking 7700 (emergency)— Flight Emergencies (@FlightEmergency) April 30, 2015
EasyJet #U28626 has a clear path to Paris Orly , on approach to runway 26— Willem Pieneman (@KingNLD) April 30, 2015