Saudi Arabia's air defences intercepted and destroyed a Houthi drone south of Mecca on Tuesday before it entered prohibited airspace over the holy city, said a spokesman for the Saudi-led military coalition.
The security of Islam's two holiest sites and of pilgrims was a "red line," coalition spokesperson Turki al-Malki said early on Wednesday, adding that the coalition would take necessary deterrent measures against the Houthis.
Mecca, home to shrines sacred to Muslims worldwide, is Islam's holiest city and the focal point of the annual hajj pilgrimage, one of the five pillars of Islam, which millions of Muslims undertake each year.
Malki described the incident as the second Houthi attempt to target Mecca, following what the coalition said was a ballistic missile launch in July 2017.