A loud explosion was heard over the Saudi Arabian capital of Riyadh on Tuesday, witnesses reported.

The cause of the blast has not yet been confirmed, but Saudi-owned al-Arabiya TV cited videos on social media of a missile being intercepted over the city.

Witnesses told Reuters that they had heard two bangs and saw a small plume of smoke in the sky.

Missile was intercepted Saturday
On Saturday, military officials from the Saudi-led coalition engaged in Yemen said they had destroyed an "enemy air target" fired towards Riyadh.

Houthi militants, backed by Iran, have launched several cross-border drone and missile attacks, targeting oil and civilian infrastructure, since Saudi Arabia began its intervention in Yemen in 2015 to restore the government the Houthis had ousted.

Read more: Deutsche welle