A loud explosion has been heard near Riyadh's airport, with unconfirmed reports saying Saudi Arabia intercepted a ballistic missile from Yemen.
Al Arabiya TV reported the missile was sacked from Yemen and was brought down close to the capital by Saudi air defence forces.
According to videos published on social media, smoke could be seen rising near Riyadh's King Khalid International Airport.
The missile was sacked across Saudi Arabia's southern border by Yemen's Houthi rebels, who are at war with the kingdom.
"And then we have a claim from Houthi rebels in Yemen that they fired a long-range missile at Riyadh and the Saudi air defence forces saying it has intercepted a long distance missile that it believes was sacked from Yemen".
Al-Qahum was referring to airstrikes this past week on a hotel and a market area in Yemen's northern province of Saada.
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Saudi Arabia's southern neighbour Yemen has been torn apart by a war between the Saudi-backed government of President Abedrabbo Mansour Hadi and Houthi rebels.
Earlier this week, a suspected airstrike by the Saudi-led coalition killed at least 29 people, including children, in northern Yemen.
The rebels continue to hold much of the country.
The intergovernmental organisation has failed to agree a peace deal to end the fighting, which has left more than 8,600 people dead since the coalition entered the conflict.
The United Nations has warned Yemen now stands on the brink of starvation. The kingdom has also imposed an air and sea blockade on Yemen.