RIYADH (Reuters) - Top world oil exporter Saudi Arabia said on Friday it was taking measures to protect its oil and economic installations from a "terrorist threat".

Western naval forces in the Gulf have been deployed to counter a possible seaborne threat to its Ras Tanura oil terminal.

"The terrorist threat to the kingdom's economic installation exists and it is a declared goal of the straying faction to affect the interests of the Saudi citizen," an Interior Ministry spokesman said.

"Saudi security forces are cooperating and coordinating with the Saudi navy to take the necessary security measures," he told Reuters.