AFP has spoken to three people who all say King Khalid Airport is being evacuated. One of them claims to have heard an explosion.
According to two sources who spoke to the AP, it was an attack.
King Khalid Airport has been repeatedly attacked over the past week. As recently as Thursday, three Saudis were killed in one of the attacks.
The Iran-backed Houthi movement has claimed responsibility for the previous attacks but has not yet commented on Saturday's events.
