The United States embassy in Saudi Arabia said it would remain closed to the public for a third day Tuesday because of "security concerns".

The United States embassy in Saudi Arabia said it would remain closed to the public for a third day Tuesday because of "security concerns".

Consular services had initially been suspended on Sunday and Monday but the closure will continue for an extra day, a notice on the embassy website said.

"Due to heightened security concerns at U.S. diplomatic facilities in Saudi Arabia, consular services will continue to be cancelled at the U.S. embassy in Riyadh and consulates general in Jeddah and Dhahran on Tuesday," it said.

Officials have not elaborated.

"We found it advisable not to open to the public because of our security concerns," embassy press officer Johann Schmonsees told AFP.

The embassy warned U.S. citizens to take extra precautions and keep a low profile if they are out in public.