"Security forces and rescue services are mobilised. The plane was isolated and passengers evacuated," a spokesperson for AENA, the group that manages airports in Spain, told AFP.
Somalia airplane makes emergency landing after blast: police
The Guardia Civil police force told AFP they were still unclear as to what the threat against the Saudi Airlines flight was.
The El Pais daily said the alert was raised by a note pinned to the interior of the plane with a knife that read: "bomb threat".
The SVA 226 flight had been due to take off at 0950 GMT but the captain requested that it be evacuated after the note was found.
Somalia airplane makes emergency landing after blast: police
The AENA spokesperson, who refused to be named, said the airport was functioning normally as the plane had been taken to an isolated area where officials were checking it.
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