Passengers on a jet set to leave Madrid for Saudi Arabia have been evacuated after the pilot reported an unspecified threat.

A spokeswoman for Spain's airport authority AENA says the Saudi Arabian Airlines jet taxied to a remote part of Madrid's airport Thursday after the threat was reported and all passengers safely disembarked.

The spokeswoman didn't have further details about the nature of the threat, but said Madrid's airport was briefly placed on a high level safety alert by law enforcement officials.

The alert level was lowered after the passengers disembarked from the jet, which was supposed to fly to Riyadh.

She said the airport was operating normally after the incident.

The AENA official talked on condition of anonymity because of agency rules preventing her from being named.