In pictures: Greek air crash

1 of 6 A Boeing 737 flying from Cyprus to the Czech capital Prague via Athens crashed on a hillside north of the Greek capital on Sunday.

2 of 6 Greek military jets were scrambled after contact was lost with the plane and the pilots were seen doubled up over their controls.

3 of 6 Emergency services were quickly on the scene but the aircraft broke up on impact and wreckage is scattered over a wide area.

4 of 6 Dense black smoke billowed from several small fires and aircraft dropped water as rescue workers fanned out.

5 of 6 Rescue services said there were no immediate signs of survivors from the Helios Airways flight, which had at least 121 on board.

6 of 6 The cause of the crash has yet to be established, but officials suspect problems with cabin pressure or oxygen supply.