Al-Turki said he had no further information about the threat.
Riyadh has been carrying out airstrikes against Iran-allied Houthi rebels in Yemen since March 26 in Operation Decisive Storm for restoring the country’s legitimacy.
“Saudi Arabia is targeted by terrorism. Usually in such situations (conflicts), there are attempts by terrorist groups to take advantage and carry out attacks,” said Al-Turki.
On Saturday, guards at the gates of a central Riyadh shopping mall stopped single men from entering and searched the bags of female shoppers.
In 2006, four Al-Qaeda militants breached the gates of Saudi Aramco’s Abqaiq plant but couldn’t cause significant damage.
Since then Saudi Arabia has strengthened the security of energy infrastructure and set up a 40,000-strong force for the purpose.