Cyprus has declared three days of mourning following the crash of a Cypriot passenger jet north of Athens, with the loss of all 121 people on board.
A Boeing 737 travelling from Larnaca to Prague crashed into a mountain northeast of Athens.
Greek Defence Ministry officials have said they suspect malfunctions in the oxygen supply or pressurisation system may have been responsible for the crash.
The pilot had sent a message saying there was a problem with the air-conditioning system shortly before the plane lost all contact with ground control.
The Helios Airways plane had been accompanied by two Greek F-16 fighter jets after losing communications with the Athens control tower on its way to the Greek capital.
One of the F-16 pilots reported that he could not see the captain in the cockpit, and his co-pilot appeared to be slumped in his seat.
The blackbox voice recorders have been recovered from the wreckage which spread over 40km of the hillside.
The Department of Foreign Affairs said they have no indication that any Irish people were involved in the crash.
Helios Airways was established in 1999 as the first privately-owned airline in Cyprus. It operates flights between Larnaca and several European airports including Dublin.
The Greek Prime Minister, Costas Karamanlis, has cut short a holiday to return to Athens.
