The error -- coupled with a depressurisation warning and then unexplained radio silence from the cockpit -- led to two jet fighters being scrambled to escort the Boeing 737 to land at the airport.
The passenger plane had been flying from Frankfurt to Istanbul when panicked passengers saw oxygen masks fall from the ceiling after it was hit by a pressurisation problem.
The pilot -- who had asked to make an emergency landing -- apparently inadvertently activated the hijack alarm as he responded to the problem, police said yesterday, confirming a report on the website of the daily Kurier newspaper.
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