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

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

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

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

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

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