UPDATE | Dozens of ambulances rushed to the scene of the reported blast at King Khalid International Airport in Riyadh hours ago, with travelers evacuated and flights diverted, according to Reuters' Saudi correspondent.

Eyewitnesses reported hearing a loud boom as people fled the airport, while a helicopter commonly used for air ambulance services was also seen at the site.

If confirmed as a new attack by Yemen's Armed Forces, the incident would mark the third such attack in less than a week.